ENHANCEMENT IN BOILING HEAT TRANSFER WITH BIO-SURFACTANT COCO-GLUCOSIDE

Abstract

ABSTRACT “ENHANCEMENT IN BOILING HEAT TRANSFER WITH BIO-SURFACTANT COCO-GLUCOSIDE” The present invention provides enhancing pool boiling heat transfer using the bio-surfactant coco-glucoside, a biodegradable and environmentally friendly alternative to conventional synthetic surfactants. The method involves incorporating coco-glucoside into working fluids such as isopropanol or ethanol to improve heat transfer efficiency on smooth metal surfaces, particularly copper. By optimizing the concentration of coco-glucoside, the invention significantly enhances heat transfer properties, including the critical heat flux (CHF) and heat transfer coefficient (HTC). This process reduces surface tension and improves wetting properties, resulting in improved cooling performance across various applications, such as heat exchangers, refrigeration systems, electronic cooling devices, and renewable energy systems. Additionally, the use of coco-glucoside reduces environmental impact by minimizing toxicity and promoting biodegradability, making it a sustainable solution for heat transfer enhancement. Figure 1

Specification

Description:TECHNICAL FIELD
[0001] The present invention relates to the field of heat transfer systems, and more particularly, the present invention relates to the enhancement in boiling heat transfer with bio-surfactant coco-glucoside.
BACKGROUND ART
[0002] The following discussion of the background of the invention is intended to facilitate an understanding of the present invention. However, it should be appreciated that the discussion is not an acknowledgment or admission that any of the material referred to was published, known, or part of the common general knowledge in any jurisdiction as of the application's priority date. The details provided herein the background if belongs to any publication is taken only as a reference for describing the problems, in general terminologies or principles or both of science and technology in the associated prior art.
[0003] The capacity of devices to dissipate significant heat while preserving material temperatures below specified limits is becoming more and more important for device performance in various applications. The pool boiling process efficiently removes heat from the surface, crucial in industrial applications like cooling systems and electronics. Conventional techniques frequently have drawbacks including excessive energy use, decreased efficiency, and surface fouling. Enhancing heat transmission in pool boiling is crucial for both energy conservation and performance improvement in those applications.
[0004] Over the past few decades, numerous studies have investigated methods to enhance heat transfer in pool boiling processes. Various passive techniques, including surface modification, coating of heating surfaces, and the addition of additives to the working fluid, have been explored to improve heat transfer efficiency. Among these techniques, the incorporation of additives such as Nano-fluids and surfactant solutions has garnered considerable attention from researchers. Numerous studies have documented the enhancement of pool boiling heat transfer with the use of Nano-fluids and surfactants.
[0005] Surfactant additives offer distinct advantages over Nano-fluids, particularly in terms of scalability. Despite this, bio-surfactants, have received relatively less attention in heat transfer applications compared to chemical or synthetic surfactants. In this study, the heat transfer performance of a bio-surfactant solution, specifically coco glucoside, in pool boiling experiments is investigated. Pool boiling experiments were conducted on a smooth copper surface using Isopropanol and ethanol as the working fluids, with varying concentrations of bio-surfactant. The results are compared with those obtained from experiments using pure liquid.
[0006] In light of the foregoing, there is a need for Enhancement in boiling heat transfer with bio-surfactant coco-glucoside that overcomes problems prevalent in the prior art associated with the traditionally available method or system, of the above-mentioned inventions that can be used with the presented disclosed technique with or without modification.
[0007] All publications herein are incorporated by reference to the same extent as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to the definition of that term provided herein, the definition of that term provided herein applies, and the definition of that term in the reference does not apply.
OBJECTS OF THE INVENTION
[0008] The principal object of the present invention is to overcome the disadvantages of the prior art by providing Enhancement in boiling heat transfer with bio-surfactant coco-glucoside.
[0009] Another object of the present invention is to provide Enhancement in boiling heat transfer with bio-surfactant coco-glucoside that improves the two-phase boiling heat transfer is by using nanofluids or by surface modifications.
[0010] Another object of the present invention is to provide Enhancement in boiling heat transfer with bio-surfactant coco-glucoside that can increase the critical heat flow, there is still debate regarding their impact on the performance of boiling heat transfer.
[0011] Another object of the present invention is to provide Enhancement in boiling heat transfer with bio-surfactant coco-glucoside, wherein the deposition of nanoparticles on the heated surface lowers the boiling heat transfer coefficient by increasing the heat transfer resistance.
[0012] Another object of the present invention is to provide Enhancement in boiling heat transfer with bio-surfactant coco-glucoside, wherein using surface modification techniques, there are several passive enhancement methods for pool boiling. Long-duration boiling tests in certain investigations have demonstrated that micro/nanoscale surface features may deteriorate or even lose their enhancing properties over time.
[0013] The foregoing and other objects of the present invention will become readily apparent upon further review of the following detailed description of the embodiments as illustrated in the accompanying drawings.
SUMMARY OF THE INVENTION
[0014] The present invention relates to Enhancement in boiling heat transfer with bio-surfactant coco-glucoside.
[0015] It has been noted that the majority of surfactants that have been investigated to date are synthetic or chemically inorganic, making them less environmentally friendly because they may be hazardous to aquatic life and not biodegradable. Therefore, it's critical to investigate novel surfactants that provide less of a risk to the environment. At the same time, efforts should be made to increase CHF value in addition to HTC. In this particular context, biosurfactants exhibit considerable potential; nonetheless, their thorough exploration in pool boiling heat transfer augmentation approach has not yet occurred. Properties of coco- glucoside surfactant
Physico-chemical properties of coco glucoside surfactant.
Chemical Formula
C18H36O6
Ionic nature non-ionic
Appearance yellow, clear liquid in appearance, and it has a slight odor and is water soluble
Molecular weight 320.42168
Produced from made by chemically reacting the non-drying fatty alcohol derivative from coconut oil and sugar glucose.
CAS Number 141464-42-8

Table 1: Physico-chemical properties of coco glucoside surfactant.
[0016] Research suggests that pool boiling heat transfer can be notably improved by modifying the liquid with additives like surfactants, polymers, and nanoparticles. Nanofluids show potential for significantly increasing Critical Heat Flux (CHF), although their impact on heat transfer coefficient remains debated due to various factors. Polymers like Separan AP-30 and HEC can enhance boiling performance, but heat transfer from nucleate boiling is dependent on the polymer added to the boiling fluid. Conversely, surfactants, which are distinguished by their long-chain molecular structure having hydrophilic heads and hydrophobic tails, are mostly employed to enhance heat transfer during pool boiling due to their impoved wetting properties and reduced surface tension.
[0017] In our research, we have used Coco Glucoside as a surfactant due to it's several advantages over other surfactants. Table 2 highlights advantages of cocoglucoside as compared with other refrigerants
Comparison of coco glucoside with different surfactant
Surfactant coco glucoside SDS Nicotine Alkyl polyglycosides
Produced from coconuts synthetic plant Glucose and fatty alcohol
Biodegradable yes No yes yes
Toxicity No yes Less Less

Table 2: comparison of coco glucoside with different surfactant
[0018] some researchers have studied that adding surfactant with different concentration increases heat transfer coefficient . Elghanam et al. studied the increase in HTC by using varied surfactants with different concentrations.
[0019] While the invention has been described and shown with reference to the preferred embodiment, it will be apparent that variations might be possible that would fall within the scope of the present invention.
BRIEF DESCRIPTION OF DRAWINGS
[0020] So that the manner in which the above-recited features of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may have been referred by embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.
[0021] These and other features, benefits, and advantages of the present invention will become apparent by reference to the following text figure, with like reference numbers referring to like structures across the views, wherein:
[0022] Graph 1. Plot of HTC vs T for different values of concentration for pure water and SDS solution, in accordance with an exemplary embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0023] While the present invention is described herein by way of example using embodiments and illustrative drawings, those skilled in the art will recognize that the invention is not limited to the embodiments of drawing or drawings described and are not intended to represent the scale of the various components. Further, some components that may form a part of the invention may not be illustrated in certain figures, for ease of illustration, and such omissions do not limit the embodiments outlined in any way. It should be understood that the drawings and the detailed description thereto are not intended to limit the invention to the particular form disclosed, but on the contrary, the invention is to cover all modifications, equivalents, and alternatives falling within the scope of the present invention as defined by the appended claim.
[0024] As used throughout this description, the word "may" is used in a permissive sense (i.e. meaning having the potential to), rather than the mandatory sense, (i.e. meaning must). Further, the words "a" or "an" mean "at least one" and the word "plurality" means "one or more" unless otherwise mentioned. Furthermore, the terminology and phraseology used herein are solely used for descriptive purposes and should not be construed as limiting in scope. Language such as "including," "comprising," "having," "containing," or "involving," and variations thereof, is intended to be broad and encompass the subject matter listed thereafter, equivalents, and additional subject matter not recited, and is not intended to exclude other additives, components, integers, or steps. Likewise, the term "comprising" is considered synonymous with the terms "including" or "containing" for applicable legal purposes. Any discussion of documents, acts, materials, devices, articles, and the like are included in the specification solely for the purpose of providing a context for the present invention. It is not suggested or represented that any or all these matters form part of the prior art base or were common general knowledge in the field relevant to the present invention.
[0025] In this disclosure, whenever a composition or an element or a group of elements is preceded with the transitional phrase "comprising", it is understood that we also contemplate the same composition, element, or group of elements with transitional phrases "consisting of", "consisting", "selected from the group of consisting of, "including", or "is" preceding the recitation of the composition, element or group of elements and vice versa.
[0026] The present invention is described hereinafter by various embodiments with reference to the accompanying drawing, wherein reference numerals used in the accompanying drawing correspond to the like elements throughout the description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiment set forth herein. Rather, the embodiment is provided so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those skilled in the art. In the following detailed description, numeric values and ranges are provided for various aspects of the implementations described. These values and ranges are to be treated as examples only and are not intended to limit the scope of the claims. In addition, several materials are identified as suitable for various facets of the implementations. These materials are to be treated as exemplary and are not intended to limit the scope of the invention.
[0027] The present invention relates to Enhancement in boiling heat transfer with bio-surfactant coco-glucoside.
[0028] It has been noted that the majority of surfactants that have been investigated to date are synthetic or chemically inorganic, making them less environmentally friendly because they may be hazardous to aquatic life and not biodegradable. Therefore, it's critical to investigate novel surfactants that provide less of a risk to the environment. At the same time, efforts should be made to increase CHF value in addition to HTC. In this particular context, biosurfactants exhibit considerable potential; nonetheless, their thorough exploration in pool boiling heat transfer augmentation approach has not yet occurred. Properties of coco- glucoside surfactant
Physico-chemical properties of coco glucoside surfactant.
Chemical Formula
C18H36O6
Ionic nature non-ionic
Appearance yellow, clear liquid in appearance, and it has a slight odor and is water soluble
Molecular weight 320.42168
Produced from made by chemically reacting the non-drying fatty alcohol derivative from coconut oil and sugar glucose.
CAS Number 141464-42-8

Table 1: Physico-chemical properties of coco glucoside surfactant.
[0029] Research suggests that pool boiling heat transfer can be notably improved by modifying the liquid with additives like surfactants, polymers, and nanoparticles. Nanofluids show potential for significantly increasing Critical Heat Flux (CHF), although their impact on heat transfer coefficient remains debated due to various factors. Polymers like Separan AP-30 and HEC can enhance boiling performance, but heat transfer from nucleate boiling is dependent on the polymer added to the boiling fluid. Conversely, surfactants, which are distinguished by their long-chain molecular structure having hydrophilic heads and hydrophobic tails, are mostly employed to enhance heat transfer during pool boiling due to their impoved wetting properties and reduced surface tension.
[0030] In our research, we have used Coco Glucoside as a surfactant due to it's several advantages over other surfactants. Table 2 highlights advantages of cocoglucoside as compared with other refrigerants
Comparison of coco glucoside with different surfactant
Surfactant coco glucoside SDS Nicotine Alkyl polyglycosides
Produced from coconuts synthetic plant Glucose and fatty alcohol
Biodegradable yes No yes yes
Toxicity No yes Less Less

Table 2: comparison of coco glucoside with different surfactant
[0031] some researchers have studied that adding surfactant with different concentration increases heat transfer coefficient . Elghanam et al. studied the increase in HTC by using varied surfactants with different concentrations.
[0032] The innovative features of our invention are:
- Use of Bio-Surfactant: This innovation involves employing a bio-surfactant, coco-glucoside, rather than conventional synthetic surfactants. Coco-glucoside, derived from natural sources, offers potential environmental benefits due to its biodegradability.
- Improved Heat Transfer: Incorporating coco-glucoside surfactant into Isopropanol and ethanol working fluids results in notable enhancements in heat transfer. This improvement is vital for enhancing heat removal efficiency, especially in industrial processes reliant on efficient heat transfer.
- Optimized Pool Boiling: By adjusting parameters such as surfactant concentration, this research optimizes pool boiling on smooth copper surfaces.
- Comparative Analysis: Comparing results from experiments with the bio-surfactant solution against those with pure liquid provides valuable insights into the effectiveness of the surfactant in enhancing heat transfer performance.
- Exploration of Untapped Potential: While surfactants have been studied for their role in heat transfer enhancement, bio-surfactants like coco-glucoside remain relatively unexplored. This exploration underscores the potential of bio-surfactants in augmenting heat transfer processes.
[0033] Some of the utilities and applications of our invention are as follows:
- Heat Exchangers: Augmenting pool boiling heat transfer on metal surfaces has the potential to enhance the heat transfer coefficient of heat exchangers utilized across diverse industrial processes.
- Refrigeration Systems: Improving pool boiling heat transfer on metal surfaces can positively impact the efficiency of refrigeration systems.
- Electronic Cooling Devices: Managing heat dissipation from electronic devices is imperative to prevent overheating during operation. Enhancing pool boiling heat transfer on metal surfaces within electronic cooling systems can effectively optimize thermal management, consequently extending the longevity of electronic components.
- Aerospace Industry: In aerospace endeavors, advancements in pool boiling heat transfer on metal surfaces can yield more compact and lightweight thermal management solutions for spacecraft, aircraft, and other aerospace apparatuses.
- Renewable Energy Systems: The realm of renewable energy systems, such as solar thermal collectors, relies heavily on efficient heat transfer for converting solar energy into usable power. Augmented pool boiling heat transfer on metal surfaces holds promise for optimizing performance within such systems.
[0034] Various modifications to these embodiments are apparent to those skilled in the art from the description and the accompanying drawings. The principles associated with the various embodiments described herein may be applied to other embodiments. Therefore, the description is not intended to be limited to the 5 embodiments shown along with the accompanying drawings but is to be providing the broadest scope consistent with the principles and the novel and inventive features disclosed or suggested herein. Accordingly, the invention is anticipated to hold on to all other such alternatives, modifications, and variations that fall within the scope of the present invention and appended claims. , Claims:CLAIMS
We Claim:
1) A method for enhancing pool boiling heat transfer, the method comprising steps of:
- a) incorporating a bio-surfactant, coco-glucoside, into a working fluid;
- b) optimizing the concentration of the bio-surfactant to enhance heat transfer efficiency during pool boiling on smooth metal surfaces.
2) The method as claimed in claim 1, wherein the working fluid is selected from the group consisting of isopropanol and ethanol.
3) The method as claimed in claim 1, wherein the metal surface is a smooth copper surface.
4) A pool boiling heat transfer system, the system comprising:
- a working fluid containing coco-glucoside as a bio-surfactant;
- a smooth copper surface for boiling heat transfer;
- a mechanism for adjusting the concentration of the bio-surfactant to optimize heat transfer efficiency.

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