Nucleate Pool Boiling Heat Transfer Research Articles

Enhanced nucleate pool boiling heat transfer on CNTs-Cu nanoparticles-coated surfaces: Effects of sintering temperature and CNTs composition on pool boiling behavior

The present study involves the experimental investigation of pool boiling heat transfer characteristics on CNTs-Cu nanoparticles-coated heating surfaces. The advantages of coating the mixture of infinitesimal CNTs with Cu particles on the copper surface are to generate the active nucleation site density by porous structures and enhance the thermal conductivity of the heating surfaces. To explore the effects of sintering temperatures and CNTs composition on pool boiling behavior, we fabricated the boiling test sections under the sintering temperatures of 700, 750, and 800 °C for four different CNTs compositions of 0.0CNTs-100Cu, 0.2CNTs-99.8Cu, 0.3CNTs-99.7Cu, and 0.5CNTs-99.5Cu in wt.%. We first analyzed the surface morphologies, that is, the average pore size, porosity, and pore density, to characterize each tested sample. Pool boiling experiments were later conducted under atmospheric pressure using water to obtain the pool boiling curves and bubble dynamics for different sintering temperatures and CNTs composition. Based on the experimental analysis, nucleate boiling heat transfer enhancement was interpreted in relation to the sintering temperature with surface morphologies and CNTs composition in relation to improved pore density. Compared to the bare copper surface, the achieved maximum enhancement for boiling heat transfer coefficient and critical heat flux were 3.86 and 1.49, respectively, when a 0.5CNTs-Cu-coated surface sintered at 800 °C was applied.

Experimental investigation of nucleate pool boiling heat transfer characteristics on modified copper surface via laser-structured microstructures

This study aims to evaluate the performance of pool boiling heat transfer on a structured surface subjected to constant heat flux. A nanosecond laser ablation was used to create different surface profiles on copper samples. Specifically, a series of step-like microstructured surfaces with varying secondary groove widths were fabricated to investigate their effect on pool boiling heat transfer performance of distilled water. The results indicated a significant enhancement in heat transfer performance for the laser-structured surfaces compared to the smooth surface at low heat flux. This improvement was attributed to the increased surface area, nucleation frequency, and nucleation site density. However, at higher heat flux, the surface with a smaller secondary groove width (LS 2) exhibited a decline in heat transfer performance, which was likely due to larger bubble escaping resistance. In contrast, the surface with a larger secondary groove width (LS 1) demonstrated the best heat transfer performance. The current work would help in finding an optimum surface structuring design for gaining higher boiling heat transfer performance which benefits industries dealing with thermal management processes.

Synergistic Effects of Hydrophilic-Hydrophobic Porous Structures for Enhancing Nucleate Pool Boiling Heat Transfer

Synergistic Effects of Hydrophilic-Hydrophobic Porous Structures for Enhancing Nucleate Pool Boiling Heat Transfer

Effect of graphene oxide coating on bubble dynamics and nucleate pool boiling heat transfer

Materials coating has been proved to be an effective mean to increase the number of active nucleating sites, and therefore generate more vapor bubbles and lead to better poolboiling heat transfer performance. In this work, graphene oxide (GO) is coated on a boiling surface by self-assembly method, to enhance critical heat flux (CHF). The pool boiling is carried out on a smooth copper surface to study the effect of GO coating using distilled water as the working fluid along with bubble dynamic visualization. GO coating facilitates bubble nucleation by providing numerous microscale cavities. The visualization investigation of bubble dynamic behavior shows that the CO-coated surface exhibits a higher bubble departure frequency, a smaller bubble departure diameter and smaller bubble diameters in the pool, indicating greatly enhanced heat transfer effects. Meanwhile, the GO-coated surface exhibited a smaller contact angle than the copper surface, revealing that surface becomes more hydrophilic after GO coating. Consequently, GO-coated surface with a coating time of 4 h provides a CHF of 224.3 W/cm2 and a heat transfer coefficient (HTC) of 8.79 W/(cm2·K), representing an improvement of 94.0% in CHF and 83.5% in HTC compared to smooth copper surface.

A review of nucleate pool-boiling heat transfer in different liquids and nanofluids

The goal of this review is to examine the current state of the art in nucleate pool boiling heat transfer in a variety of different fluids. The review is divided into many sections that discuss heat transfer in pool boiling, such as pool boiling of nanofluids, boiling behavior of water–glycerin combinations, and operational parameters. With the appropriate mixes of hydrocarbons and other commercial liquids, higher heat transfer coefficients may be produced. Coatings of nanoparticles with varying layer thicknesses applied to the heater surface may be optimized to improve heat transfer from the pool to the surrounding water. The heat transfer hypothesis elucidates the peculiarities of each pool’s boiling regime. It is also possible to expand it to flow boiling by combining pool boiling liquid motion with external mechanical force. Other phase transitions, such as condensation, solidification, and melting, can also be described using boiling heat flow processes. Pool boiling performance can be improved by making a variety of adjustments to the heating surfaces as well as by using pure liquids in the water. Improvements can be made to boiling parameters such as the heat flux, the critical heat flux, the heat transfer coefficient, bubble development and departure, and so forth. A nanoparticle addition to a pure liquid or a surface coating on a heating surface can improve heat transfer and boiling properties by increasing the surface area of the liquid. Pool boiling critical heat flux was enhanced with Al2O3-water nano fluid. Authors used three different powder sizes of Al2O3 which were 0.05, 0.3 and 1.0 μm. Addition of alumina particle in water increases the boiling heat flux. Critical heat flux (CHF) was significantly enhanced using Titania and Alumina nano particles in water as compared to pure water. Average size of nano particle used was 85 nm measured by scattering electron microscope. Enhancement in Critical heat flux is due to nano particle coating on heating surface. Characteristics of nucleate boiling are greatly affected by the operating pressure. Miniature flat heat pipe (MFHP) with evaporator having micro grooved heat transfer surface gives 50% increment in critical heat flux at atmosphere pressure whereas this value increases up to 150% at 7.4 kPa pressure. The addition of CNT (carbon nanotube) to the base liquid increases the critical heat flux. Transmission electron microscopy confirms the average size of a nanoparticle as 15 nm. Authors found that by decreasing pressure from atmosphere condition critical heat flux increases to 200% with CNT/water nano fluid as compared to deionized water. SiC-water nanofluids of 100 nm size were experimented with at volume concentrations of 0.001%, 0.001%, and 0.01%. The size of the nanoparticle was confirmed by a scattering electron microscope. Authors concluded that at 0.01% of nano particle enhances critical heat flux to 105%.

A novel surfactant material for performance enhancement on nucleate pool boiling heat transfer

Long-chain surfactants have been extensively studied for boiling enhancement, while the investigation of steroid surfactants is limited. In this study, steroidal bile salts were experimentally attempted for nucleate pool boiling enhancement on flat copper surface. Four types of bile salts were found effective in improving heat transfer coefficient (HTC) in aqueous form, with SDC having the most significant effect, followed by SHDC, SC, and STGC. The STGC deposited surface exhibited a simultaneous improvement of critical heat flux (CHF) and HTC with long-term repeatability. The enhancement mechanism is discussed by means of solution properties, bubble behaviors and surfactant molecular structure. Both aqueous and deposited bile salts show considerable boiling performance with existing materials, with better safety characteristics. The findings of this study can provide a bio-friendly approach to surfactant-aided energy conversion applications and contribute to the development of new-generation green surfactant materials.

Investigation of Nucleate Pool Boiling Heat Transfer by Computational Methods in Different Cylindrical Surfaces and Inclination Angles

Investigation of Nucleate Pool Boiling Heat Transfer by Computational Methods in Different Cylindrical Surfaces and Inclination Angles

Numerical Simulation of Nucleate Boiling Heat Transfer Performance using SiO2/Water Nanofluid

Nucleate boiling regime is the most efficient regime that gives the maximum heat flux at the wall superheat range of 5 °C to 30 °C. In this current study, the nucleate pool boiling heat transfer performance of SiO2/water nanofluid are studied numerically. The effect of volume fraction (0.01 – 0.06 vol. %) of nanofluid on heat transfer coefficient and wall superheat are investigated. The variation in heat transfer coefficient (HTC) & wall superheat with different heat flux are investigated. Eulerian multiphase approach with RPI boiling model is used to carry out the simulation. The pool boiling heat transfer performance increased with rise in volume concentration of nanofluid up to an optimum concentration of 0.05 % and then it starts to decrease. A reduction in wall superheat of 6.7 %, 8.43 %, 11.27 % and 9.3 % are obtained for SiO2/water nanofluid with volumetric concentration of 0.01, 0.02, 0.05 and 0.06 vol. % respectively as compared to base fluid. Heat transfer coefficient enhanced by 3.55 %, 7.2 %, 23.87 % and 19.67 % for SiO2/water nanofluid with volumetric concentration of 0.01, 0.02, 0.05 and 0.06 vol. % respectively as compared to base fluid.

Influence of bubble departure control on nucleate pool boiling heat transfer of electrodeposited copper foam: Experiments and correlation

Pool boiling is highly suitable for cooling in various industries due to its high heat transfer capability. Among pool boiling enhancement methods, embedding open-cell metal foams to the heater surface are particularly beneficial as they increase the effective heat transfer area. In this study, by analyzing 30 samples, the effect of pore density, thickness, and channels with different diameters on copper metal foams were investigated. In addition, the electrodeposition method was used to deposit a porous layer on the edges of copper metal foam to increase boiling efficiency in atmospheric conditions with deionized water as a working fluid. As an innovation, holes with different diameters were created inside the specimens using machining to construct a suitable exit path for the bubbles. According to the results, creating a channel with a diameter of 3 mm inside foams with thicknesses of 8 mm and 10 mm, both in the untreated and electrodeposited modes, improved the heat transfer coefficient (HTC) compared to foam without the channel. On the other hand, a 5 mm diameter channel decreased boiling efficiency due to a substantial reduction in effective surface area compared to a 3 mm channel. At low heat fluxes, the electrodeposited sample with a pore density of 20 ppi, a thickness of 10 mm, and a channel diameter of 5 mm achieved an HTC of 13.56 W/cm2. K that was approximately 3.5 times higher than the plain copper sample. A high-speed camera was utilized to observe the bubble departure from the channels during changing the heat flux. Finally, by considering the dimensionless parameters of the problem, an experimental correlation was derived to predict the HTC values.

Thermal management of power electronics using nanofluids and nucleate boiling heat transfer technique

Nucleate boiling is an efficient solution for thermal management of power electronics where high-intensity heat flux needs to be transferred in a compact space. Both micro surfaces and nanofluids are used in literature to enhance the performance of nucleate pool boiling heat transfer systems; however, the effect of nanofluids over the microporous surface still needs to explore in several phase change heat transfer applications. The study’s objective is to examine the performance of nanofluid over microporous surfaces in Nucleate Boiling Heat transfer (NBHT) and performs a comparative analysis with plain and micro-porous surfaces. The study analyzed three ceramic (Alumina) nanofluids for nucleate pool boiling heat transfer (NBHT) over plain and microporous surfaces. The literature reported enhanced performance of nanofluids over the plane surface is verified in the study before proceeding to the detailed analysis over the microporous surface. Three different concentrations of 0.005%, 0.0005%, and 0.00005% were tested for the nanofluid. For plane surface, the critical heat flux (CHF) has been increased to 1035 [kW/m2] for Alumina from 783 [kW/m2] for deionized water, with the average increase in heat transfer coefficient (HTC) being 46.5%. The maximum CHF has been reported for micro-porous surfaces with a value of 1110 kW/m2. Out of the tested surfaces and fluids combination, the micro-porous surfaces with deionized water have been concluded as the most efficient surface with the highest heat transfer capacity for thermal management of high-power electronics and other high heat flux applications.

Investigation of Nucleate Pool Boiling Heat Transfer of Water on Platinum Wire Under Hypergravity and Earth’s Gravity

Investigation of Nucleate Pool Boiling Heat Transfer of Water on Platinum Wire Under Hypergravity and Earth’s Gravity

Experiments to understand bubble base evaporation mechanisms and heat transfer on nano-coated surfaces of varying wettability under nucleate pool boiling regime

Absolute surface wettability effects on the characteristics of nucleate pool boiling heat transfer under saturated conditions are investigated with water as working fluid. Wettability of the base surface (ITO-coated sapphire) is modified by coating 60 nm thick SiO2 film using different thin film deposition techniques. In this way, two surfaces with modified wettability (30 o and 65 o static contact angles) have the same surface chemistry with negligible variation in surface roughness, while the base surface itself acts as the third surface with 90 o static contact angle. Experiments are conducted for various constant heat flux conditions. Bubble dynamics and temperature distributions of the substrate surface are mapped in-situ using high speed videography and IR thermography, respectively. Pool boiling curves and overall heat transfer coefficient curves, obtained from the recorded IR images, showed that the overall boiling performance increases with enhanced surface wettability. The observed enhancement has been explained on the basis of the modified bubble dynamics and the associated bubble base evaporation mechanism. The bubble dynamics parameters such as bubble departure diameter and departure frequency, and nucleation site density (NSD) were found to get altered so as to augment the total evaporative heat flux with increasing surface wettability. The heat transfer coefficients and heat transfer rates corresponding to bubble base evaporation for isolated vapor bubble revealed that higher wettability surfaces outperform the surfaces with lower wettability in heat transport through bubble base evaporation. The corresponding underlying mechanisms have been identified. In addition, it was found that the microlayer evaporation mechanism is more efficient as compared to that based on pure contact line evaporation in transporting the heat away from the surface.

Molecular dynamics study on enhanced nucleate boiling heat transfer on nanostructured surfaces with rectangular cavities

Nanostructured surfaces have been proved to bring remarkable enhancements in nucleate boiling heat transfer, which are particularly attractive in thermal energy fields. To fully understand the effects of nano-cavities on nucleate boiling and elucidate the underlying enhanced mechanisms, a comparative molecular dynamics study on nucleate pool boiling heat transfer of liquid argon over the plain copper substrate and nanostructured substrates with different rectangular cavities is performed. The nano-cavities have the same depth of 5 nm and different widths of 3 nm, 5 nm and 8 nm. The bubble dynamics behavior on various surfaces is observed based on simulation snapshots. The results manifest that the rectangular nano-cavity can significantly reduce time and wall superheat required for the onset of nucleate boiling, as well as delay the transition from nucleation boiling regime to film boiling regime. The incipient nucleation time tin can be reduced to 990 ps from 5600 ps. Additionally, compared with the plain substrate, the rectangular nano-cavity can result in a striking decrease in boiling initiation temperature, which is up to 59 K. The underlying enhanced mechanisms are well elucidated based on the structural feature of the rectangular nano-cavity and simulation results. The liquid inside the rectangular cavity can obtain additional thermal energy from sidewalls, leading to a significant local heat accumulation effect and the heat transfer efficiency reinforcement. It is found there is a coupling enhancement effect of heat accumulation when the width of rectangular cavity is smaller. Consequently, the 3 nm wide nano-cavity can achieve maximum enhancement. These findings provide crucial evidence at the nanoscale to verify that nano-cavity can significantly enhance nucleate boiling not only by reducing nucleation time but also by decreasing the boiling initiation temperature. This study is of importance to promote further insights into the enhanced mechanism of nucleate boiling at the nanoscale and provide guidance for the performance improvement in boiling surfaces for advanced thermal energy systems.

Experimental study on nucleate pool boiling heat transfer characteristics of R32 + R1234yf binary mixtures

• Boiling heat transfer deteriorated most at x R32 = 0.4277 for different heat fluxes. • Mass transfer resistance weakened the bubble coalescences at high heat flux. • Phase equilibria and physical property together affected heat transfer of mixtures. • The accuracies of two existing correlations were improved to within 5.6%. Although R1234yf is a new environmentally-friendly refrigerant with low GWP, its thermal performance is inferior to that of conventional refrigerants. Mixing R1234yf with R32 can overcome the respective shortcomings of each component. Therefore, understanding the pool boiling heat transfer characteristics of R32 + R1234yf mixtures is of great importance to the design of heat exchangers and the optimization of thermal systems. This study carried out the pool boiling experiments of R32, R1234yf, and their binary mixtures. The boiling curves, heat transfer coefficients, and bubble images of pure and mixed refrigerants were obtained. The results showed that the addition of R32 effectively improved the heat transfer performance of R1234yf. Meanwhile, the mixing effect weakened the bubble coalescence and enhanced the heat transfer performance under high heat flux. It was found that the heat transfer deterioration of mixtures was not only influenced by the vapor–liquid phase equilibrium but also related to the nonlinearly varying physical properties. Based on the experimental data, eleven widely used correlations for boiling heat transfer coefficient of binary mixtures were analyzed with two selected and further modified. The prediction performances of the modified correlations improved significantly, with the mean absolute relative deviation (MARD) reducing to 5.16% and 5.53%, respectively.

Heater size and gravity level effects on nucleate pool boiling heat transfer under controlled wall heat flux condition

With the ability of dissipating large amount of latent heat in nearly isothermal process, pool boiling heat transfer is an efficient solution for cooling problem of different sized electronic devices in different gravities. For the practical heat dissipation of electronic device usually occurs at controlled wall heat flux condition, it is essential to reveal pool boiling heat transfer characteristics at different sizes and gravities under controlled wall heat flux condition. In this paper, boiling heat transfer mechanisms on two sized smooth silicon chips (chip S 1 × 1 and chip S 2 × 2) in ground gravity and microgravity were studied. It was found that the gravity scaling parameters developed under controlled wall temperature condition cannot be applicable to the controlled wall heat flux condition. Under controlled wall heat flux condition, the microgravity boiling heat transfer performance on chip S 1 × 1 is in surface tension dominated boiling (SDB) regime in the whole heat flux range. While for chip S 2 × 2, it is in SDB regime when heat flux is smaller than 6.44 W·cm−2, but enters into buoyancy dominated boiling (BDB) regime when heat flux is larger than 6.44 W·cm−2. The critical point of the two boiling mechanisms occurs when the threshold gravitational acceleration equals to the experimental microgravity. In BDB regime, the power law coefficient reflecting the gravity effect on nucleate boiling heat transfer performance (mBDB) for controlled wall temperature condition is larger than that for controlled wall heat flux condition, indicating a greater impact of gravity level under controlled wall temperature condition. Moreover, mBDB for controlled wall temperature condition is affected only by non-dimensional wall temperature T*. While for controlled wall heat flux condition, mBDB increases with increasing T* but decreases with increase in heater size, and heater size has a greater influence on mBDB. Based on the available data, the gravity scaling parameters for controlled wall heat flux boiling were developed, which can accurately predict the microgravity boiling heat transfer performance on two sized chips.

Experimental investigations on nucleate pool boiling over micro-finned cylindrical surfaces

The nucleate pool boiling heat transfer over micro-finned cylindrical surfaces has application in the heat exchangers used in thermal power plants and chemical industries. The estimation of boiling heat transfer coefficient is an important parameter in the design of two-phase heat exchangers using micro-finned cylindrical surfaces. In the present work, related experimental investigations on four micro-finned cylindrical surfaces with different surface geometry using refrigerant R-141b at atmospheric pressure are conducted to determine the boiling heat transfer coefficient over micro-finned cylindrical surfaces. A correlation is developed by dimensional analysis wherein the effects of geometrical parameters, operating pressure and thermo-physical properties of fluids are taken into consideration and dimensional analysis conducted using Buckingham π-theorem. The correlation developed utilizes experimental data obtained over the present study as well as from previous studies by various researchers including experimental data for water over different micro-finned cylindrical surfaces at 1 bar by Mehta and Kandlikar, experimental data for R123 at 0.97 bar by Saidi et al. and experimental data for R134a over micro-finned cylindrical surface at 6.1 bar, 8.1 bar, 10.1 bar and 12.2 bar by Rocha et al. The heat flux ranging from 5 to 1100 kW/m2 are considered for the analysis. The data points have been compared with the proposed correlation and the absolute average deviation of the whole data set was obtained as 13.43% with root mean square deviation of 0.0273. All the predicted values were within ±15% of the experimental values of the boiling heat transfer coefficient.

Nucleate pool boiling heat transfer of R-1234ze(E) and R-134a on GEWA-B5H and smooth tube with the influence of POE oil

• Effect of POE oil (0.28–5%) on pool boiling with R-1234ze(E) is investigated. • Tests were conducted on GEWA-B/smooth tube with heat flux ranging from 10 −90 kW/m 2 . • The performance of R-1234ze(E) is 7–18% lower than R-134a on GEWA-B tube. • The performance of R-1234ze(E) is 27% lower than R-134a on smooth tube. • The HTC enhancement of R-1234ze(E)-oil mixtures is superior to R-134a-oil mixtures. Nucleate pool boiling heat transfer characteristics of pure refrigerants of R-134a, R-1234ze and their corresponding lubricant/refrigerant mixture of R-134a/POEA-68, and R-1234ze/POEA-68 on horizontally arranged enhanced tube (GEWA-B5H) are reported in detail. Tests are conducted at saturation temperatures of 10 °C, 0 °C, and −6 °C having oil concentration from 0.28% to 5%. Tests are conducted with decreasing heat flux range from 90 kW/m 2 to 10 kW/m 2 . It appears that the heat transfer coefficient (HTC) of pure R-1234ze on the GEWA-B5H tube is nearly 18%, 10%, and 7% lower than those of R-134a at saturation temperatures of 10 °C, 0 °C, and −6 °C, respectively. For the smooth tube, it was found that the HTC of pure R-1234ze is nearly 27% lower than that of R-134a at all the saturation temperatures. Generally, the presence of a small amount of lubricant oil impairs the HTC on an enhanced surface. But the present experimental investigation shows that the presence of lubricant oil on an enhanced surface may alter the HTC appreciably, and it is highly dependent on the saturation temperature, reduced pressure, and transport properties of refrigerant-oil mixtures. The results indicated that the highest enhancement ratio prevailed at a heat flux of 30 kW/m 2 and the HTC is about 17% and 35% with a 2% oil concentration for R-134a/POEA-68 oil mixture at saturation temperature 0 °C, and −6 °C respectively. Correspondingly, R-1234ze(E)/POEA-68 oil mixtures showed the highest 26% and 43% enhancement in the HTC at 0 °C and −6 °C saturation temperature subject to 0.28% oil concentration at a heat flux of 70 kW/m 2 . The HTC enhancement ratios of the GEWA-B5H tube were 2.9 – 8.8 for R-1234ze and 2.8 – 6.6 for R-134a compared to the smooth tube.

Pool boiling of R-134a refrigerant over a thin film aluminum nanostructured coated surface

Experimental investigation of nucleate pool boiling heat transfer analysis of R-134a is carried out on a bare copper surface and over a 50, 100, 150 and 200 nm thickness aluminum nanostructured coated surfaces at 10 °C and 15 °C saturation temperature. Thin film aluminum nanocoating on the polished copper surface is produced by using Thermal Evaporation Physical Vapor Deposition Technique. The coated surfaces are distinguished with the film thickness, roughness by 2D profilometer, imaging by scanning electron microscopy (SEM) and existing of coating material by energy dispersive X-ray spectroscopy (EDX). The effects of thin film aluminum nanocoating over a bare copper surface with increasing heat flux is thoroughly examined. It is observed that maximum enhancement in heat transfer coefficient at 150 nm thickness of thin film aluminum nanocoated surface is about 2.49 times and 2.81 times compared to copper surface over a heat flux range of 6–90 kW m−2 at 10 °C and 15 °C saturation temperatures respectively. Coated surfaces showed a steady increment in heat transfer coefficient values with the increase in the heat flux values. About 26.8% augmentation in heat transfer coefficient of bare copper surface is observed at 15 °C saturation temperature compared to 10 °C saturation temperature. The heat transfer coefficient values of bare copper surface are validated with Rohsenow and Cooper correlations of nucleate boiling and agreed well with measured data with a standard deviation of ±9%, ±13.5% for both correlations at 10 °C and 15 °C saturation temperatures respectively.

EXPERIMENTAL STUDY ON NUCLEATE POOL-BOILING HEAT TRANSFER OF R141B OVER PLAIN AND MICRO-FINNED CYLINDRICAL SURFACES AT DIFFERENT PRESSURES

EXPERIMENTAL STUDY ON NUCLEATE POOL-BOILING HEAT TRANSFER OF R141B OVER PLAIN AND MICRO-FINNED CYLINDRICAL SURFACES AT DIFFERENT PRESSURES

Fabrication of nano-copper surfaces by thermal evaporation technique to investigate nucleate pool boiling heat transfer performance of R-141b

In the present work, nano-Cu particle coatings, which were fabricated on a bare Cu surface using various thickness coating through a thermal evaporation technique, were used as heating surfaces to study the pool BHT performance of refrigerant R-141b. The heating surfaces, viz, 50 nm, 100 nm, 150 nm, and 200 nm thick nano-Cu particle coated surfaces over bare Cu heating surface are used in this experimentation. To reveal the formation of crystal structure on coated surfaces, scanning electron microscope (SEM) was used. Electron Discharge Spectroscopy (EDS) technology was employed to measure the percentage distribution of elements in the coating surfaces. Maximum heat transfer coefficient (HTC) enhancements of 10.5%, 15.7%, 26.6%, and 45.2% are observed for all the coated surfaces of thicknesses of 50 nm, 100 nm, 150 nm, and 200 nm when compared with bare Cu surfaces. Increases in HTC in nano-Cu coated surfaces were attributed to creation of high-density active nucleation sites and enhanced surface roughness. Other published data were used to predict the experimental data, with some deviations observed in the HTC. Thus, this paper is expected to gain importance due to the development of surface engineering with respect to energy conversion management and heating applications.