High Heat Transfer Rates Research Articles

Turbulent Rayleigh–Bénard convection in non-colloidal suspensions

This study presents direct numerical simulations of turbulent Rayleigh–Bénard convection in non-colloidal suspensions, with special focus on the heat transfer modifications in the flow. Adopting a Rayleigh number of $10^8$ and Prandtl number of 7, parametric investigations of the particle volume fraction $0\leq \varPhi \leq 40\,\%$ and particle diameter $1/20\leq d^*_p\leq 1/10$ with respect to the cavity height, are carried out. The particles are neutrally buoyant, rigid spheres with physical properties that match the fluid phase. Up to $\varPhi =25\,\%$ , the Nusselt number increases weakly but steadily, mainly due to the increased thermal agitation that overcomes the decreased kinetic energy of the flow. Beyond $\varPhi =30\,\%$ , the Nusselt number exhibits a substantial drop, down to approximately 1/3 of the single-phase value. This decrease is attributed to the dense particle layering in the near-wall region, confirmed by the time-averaged local volume fraction. The dense particle layer reduces the convection in the near-wall region and negates the formation of any coherent structures within one particle diameter from the wall. Significant differences between $\varPhi \leq 30\,\%$ and 40 % are observed in all statistical quantities, including heat transfer and turbulent kinetic energy budgets, and two-point correlations. Special attention is also given to the role of particle rotation, which is shown to contribute to maintaining high heat transfer rates in moderate volume fractions. Furthermore, decreasing the particle size promotes the particle layering next to the wall, inducing a similar heat transfer reduction as in the highest particle volume fraction case.

Thermal performance of ternary-hybrid nanofluids through a convergent-divergent nozzle using distilled water - ethylene glycol mixtures

A computational analysis is conducted based on ternary-nanoparticles performance for base fluid mixture through a convergent-divergent (CD) nozzle. Since the thermal phenomena through a CD nozzle exposes many attention-grabbing performances, it deserves additional investigation for laminar flow characteristics. Using ternary-nanoparticles at different base fluid mixture makes the study more robust and interesting to analyze the real situation better. In this study, the properties of cobalt (Co), silver (Ag), and zinc (Zn) nanoparticles along with base fluid mixtures of distilled-water (DW) and ethylene glycol (EG) as (100:0), (60:40), (50:50), and (0:100), are employed. A wide range of inlet velocity, solid concentrations, nanoparticle size and magnitude of nanoparticle shape factor is considered in this research. The mixtures of nanoparticles are considered as a ratio of (0:1/2:1/2), (1/2:0:1/2), (1/2:1/2:0), (1/6:1/6:2/3), (1/6:2/3:1/6), (2/3:1/6:1/6) and (1/3:1/3:1/3). The mathematical model is formulated using Navier-Stokes equations, energy conservation with proper boundary conditions, and solved using finite element method. Among the considered base fluid mixtures, the highest heat transfer rate is obtained for EG-Co-Ag-Zn nanofluid. A relatively higher heat transfer rate is found for all base fluid mixtures with nanoparticles ratio (1/6:2/3:1/6) compared to other combinations. Furthermore, advanced rate of thermal transport is found using laminar shape nanoparticles.

Copper-alumina hybrid nanofluid droplet phase change dynamics over heated plain copper and porous residue surfaces

Droplet phase change is the key phenomenon for high heat transfer rates in spray or drop-wise cooling applications. Despite high cooling efficiency of the spray cooling technology, conventional fluids, such as water, cannot be used for thermal management of modern high heat flux devices due to their immense power density, resulting in early device failures. To address this issue, in this research, we experimentally study the evaporation performance for various volumes of the copper-alumina hybrid nanofluid (CAHF) droplet on a plain copper substrate and compare it with water (H2O) droplet in sub-boiling and boiling regimes (i.e., for substrate temperatures of 25–170 °C). We also numerically investigate and compare the internal velocity and thermal fields of CAHF and H2O droplets on a heated plain copper substrate. Besides the plain copper surface, we examine the phase change behaviour of the subsequent CAHF droplet over a heated residue surface that was obtained from the phase transition of the first CAHF droplet on a heated plain copper substrate. Our results demonstrate that the evaporation rate of CAHF droplets on a plain copper surface is up to 24% and an order of magnitude higher than water droplets in sub-boiling and nucleate boiling regimes, respectively. Moreover, the evaporation rate of the CAHF droplet on a residue surface increases up to 141% and 800% compared to that on a plain copper surface in sub-boiling and nucleate boiling regimes, respectively. Furthermore, the latent heat flux up to 10 times can be achieved using the CAHF droplet compared to H2O droplet on a plain copper substrate in the nucleate boiling region, making the CAHF a potential fluid for high heat flux cooling applications.

Improving the thermal performance of (ZnO-Ni /H2O) hybrid nanofluid flow over a rotating system: the applications of Darcy Forchheimer theory

The present study focused on the effect of Lorentz force and Hall current on hybrid nanomaterial flow over a transient stretching and rotating disk. Darcy-Forchheimer law was utilized. A porous stretching disk accounted for the slip effect. Energy expression is modeled through heat dissipation, radiation, and exponential heat source. Hybrid nanomaterial is used for the current model, which is the combination of ZnO and Ni with water as a base liquid. The modeled PDE system is converted to ODEs employing suitable variables. The obtained ODEs are approximated by the ND-Solve technique. Our analysis conveys that the rate of heat transfer is higher in nanomaterial compared with hybrid nanomaterial. Hall current enhances the fluid motion, whereas the inertia factor shows the opposite behavior. Additionally, it is found that the Lamina shape of nano-particles has a higher rate of heat transfer than other shapes.

Nonsimilar convective thermal transport analysis of EMHD stagnation Casson nanofluid flow subjected to particle shape factor and thermal radiations

Nanofluids are quite popular among researchers due to their high heat transfer rates, which have significant industrial applications. The primary objective of this article is to give a novel analysis of the two-dimensional electromagnetohydrodynamic (EMHD) stagnation point flow of Casson nanofluid with heat source/sink and thermal radiations. Nanoparticles such as Iron Oxide (Fe2O3) and Gold (Au)) are used with blood as base fluid. Nanomaterials are classified into several categories based on their shapes, properties, and sizes. The effects of shape factors namely sphere, tetrahedron, hexahedron, column, and lamina with various parameters are also included in this analysis. This study presents the implementation of single-phase (Tiwari-Das) model for Casson nanofluid by considering blood as base fluid. Instead of the Buongiorno model, which largely depends on Brownian and thermophoresis diffusion effects for heat transfer analysis. The single-phase model incorporates the volume fraction of nanoparticles for the evaluation of heat transfer. Relying on the Tiwari–Das model for nanofluids, a mathematical framework is constructed. To simplify the governing flow equations, proper nonsimilar conversions are used to appropriately transform the given partial differential system to dimensionless form. The rehabilitated mathematical model is simulated by employing local non-similarity technique via bvp4c. The consequences of sundry parameters against velocity and temperature profiles of Casson nanofluid are presented pictorially. The velocity profile is observed to decrease with increasing Casson fluid parameter values while enhancement is noticed with rising electric field parameter values. The temperature profile improves with increasing magnetic number, nanoparticle concentration, Eckert number, Biot number, and heat generation parameter, whereas it degrades with increasing electric field parameter. Temperature profile is maximum for lamina shaped particle while it has minimum values for sphere shape nanoparticles. The Nusselt number and skin-friction coefficients are also introduced as tools for determining the physical characteristics of Casson nanofluid flow. The obtained results of this model meticulously match those existents in the literature for various limiting constraints. The authors discussed the local non-similarity technique for simulating the dimensionless non-similar structure. To the best of authors observations, no such study for the considered flow model is yet published in literature.

Performance analysis of the plate heat exchangers for heating systems

In this work, thermodynamic analysis of the plate heat exchangers was carried out as experimentally. An experimental heating system with a plate heat exchanger (PHE) was designed and set up for this aim. Thermodynamic analysis of the experimental system at different temperatures and three different flow rates was carried out. The heat transfer rate and effectiveness values are calculated and obtained results were presented. As a result of the study, it was determined that the heat transfer rate increased for each of the three flow rates in PHE with increased inlet hot water temperature. According to the results of experiments, the highest heat transfer rate which is 2.5 kW, was obtained from a flow rate of 0.239 kg/s. The highest efficiency value was obtained as 44% for this fluid flow rate. It has been seen that the flow rate of 0.321 kg/s, which has the highest heat transfer and efficiency value mathematically, is not suitable for the PHE sizes used.

Shape effects on 3D MHD micropolar Au-MgO/blood hybrid nanofluid with Joule Heating

Hybrid nanofluid can be considered another nanofluid due to its thermal properties and potential utilisation in heat transfer analysis. This examination's principal objective is to introduce a correlation between conventional nanofluid and hybrid nanofluid characteristics due to micropolar theory, viscous dissipation, and the effect of Joule heating over an exponentially stretched surface by considering the convention. The governing equations are transformed into a system of nonlinear equations through an appropriate similarity transformation method. The reduced system of equations is evaluated by applying the fifth-order R-K-Fehlberg technique and the shooting process. By plotting the graphs for velocity, microrotation, and temperature distributions, examination between the nature of pure blood, MgO/blood nanofluid, and Au-MgO/blood hybrid nanofluid are analyzed and noted. Results of skin friction and Nusselt number are also presented to understand better the nature of flow and heat transmission rate in a nanofluid and hybrid nanofluid. The closing remarks of this analysis are that the rate of heat exchange is 13.8 percent is high in hybrid nanofluid compared to that of nanofluid even within sight of micropolar impacts, viscous dissipation, and convective condition. Finally, platelet size nanoparticles have a higher heat transfer rate than other nanoparticles.

Enhancing the Thermal Performance of Radiators using Nanofluids- A CFD Approach

In the present study, the thermal performance of a simple car radiator has been investigated for different conditions such as coolant type and coolant inlet velocity. Different types of nanofluids have been used as coolants such as Al2O3, CuO, and TiO2 nanofluids. The base fluids taken are water and 50-50 volume percentage of water and ethylene glycol (EG) mixture. The volume percentage of 1%, 2%, and 3% of nanoparticles has been used for all the cases. The lowest outlet temperature and highest heat transfer rate are found for Water-EG based nanofluids. The lowest coolant outlet temperature (355.91 K) is found for 3 vol% of Water-EG based TiO2 nanofluid and the highest heat transfer rate (67.87 W) is found for 3 vol% of Water-EG based CuO nanofluid. The highest outlet temperature and the lowest heat transfer rate are found to be 358.50 K and 51.73 W respectively for water-based CuO nanofluid. Nonetheless, the Water-EG based nanofluids showed better results than water-based nanofluids showing a low coolant outlet temperature and a high heat transfer rate.

Energy dissipative MHD Cu-AA7072/water-based hybrid nanofluid flow over a perpetually moving slender needle

Right now, numerous nanoparticles are available in literature amidst these Copper, Aluminium and their alloys are sole feature nanoparticles with high physical, thermal and chemical possessions. These are enormously utilized in aircraft parts, generating space crafts and production of rocket climbing frames etc. This paper describes the steady and two-dimensional magnetohydrodynamic boundary layer flow of a hybrid nanofluid past a moving slandering needle. Copper (Cu) and Alumina Alloy (AA7072) are used as hybrid nanoparticles by considering water, a base fluid. The fundamental partial differential equations are transfigured to a set of nonlinear ordinary differential equations, then numerically solved with the help of MATLAB solver (bvp4c). The profiles of velocity, temperature and physical variables like skin friction coefficient and the local Nusselt number are displayed through figures for various parameters. The results are explored with nanofluid (Water + AA7072, Water + Cu) and hybrid nanofluid (Water + Cu + AA7072). The highest heat transfer rate can perceive in the case of Copper nanoparticles than AA7072 and hybrid cases (Water + Cu + AA7072) whereas skin friction is more in the case of Water + AA7072.

Two phase heat transfer performance intensification of massecuite over bidirectional microstructure surfaces

ABSTRACT An experimental investigation is conducted to study the two-phase heat transfer behavior of a shear-thinning Non-Newtonian (NN) fluid, i.e., “Massecuite,” at atmospheric pressure over bi-directional microstructured surfaces for the heat flux range from 70 to 200 kW/m2. Two-phase heat transfer characteristics of a Newtonian Fluid, that is, distilled water, is also studied for the sake of comparison. Both aqueous XG solution and water exhibit higher heat transfer rate over microstructured surfaces as compared to plain surface. The heat transfer coefficient (HTC) of aqueous XG solution was found to increase over the microstructured surface from B-90-3-2-0.4-R to B-90-3-2-0.4-C to B-60-3-2-0.4-Nil. An enhancement of 83.35% is observed in the aqueous XG solution’s two-phase HTC over a bi-directional inclined tunnel-based microstructure surface (B-60-3-2-0.4-Nil) compared to the plain surface.

Effect of binary mixed-surfactants and hybrid nanofluid on spray cooling heat transfer

The present study emphasizes the spray-cooling enhancement of a copper heater block of 10 mm2 cross-sectional area with binary mixed surfactant based fluid and hybrid nanofluid using a pressure swirl nozzle with an orifice size of 0.51 mm. The experiments have been carried out at two distinct fluid input temperatures of 27 °C and 42 °C, with a volumetric flux of 3.50 cm3/cm2s. Polyvinyl pyrrolidone (polymer surfactant), Sodium dodecyl sulfate (an anionic surfactant), Tween-20 (a nonionic surfactant) have been used as binary mixed surfactant systems in distilled water. The best performance has been obtained with SDS:Tween-20, which resulted in a maximum heat flux of 264 W/cm2 and a heat transfer coefficient of 3.59 W/cm2K. When compared to distilled water, the heat transfer coefficient increased by 32.2%, but only by 25.2% and 18.1% with PVP:Tween-20 and SDS:PVP surfactant solutions. Further, the effect of a hybrid nanofluid, which is a colloidal mixture of Titanium dioxide (TiO2) and MWCNTs (multi-walled carbon nanotubes) in distilled water, has been studied to better understand spray cooling heat transfer enhancement. Heat transfer was first enhanced by the hybrid nanofluid and then decreased as the volume concentration was increased from 0.1% to 0.3%. A maximum heat flux of 234 W/cm2 and a heat transfer coefficient of 3.15 W/cm2K has been achieved, with a heat transfer coefficient improvement of nearly 27.3% compared to distilled water. However, the mixed surfactant system outperformed, giving nearly 12.8% improvement in heat flux values. It has been observed that low surface tension resulted in high heat transfer rates. Furthermore, the effect of 15 °C subcooling on heat transfer performance has been investigated. A new correlation to find Nusselt number is proposed in terms of Reynolds number, Weber number and Prandtl number with a mean absolute error of 7.16%.

Forced convective MHD flow of Reiner-Philippoff fluid induced by hybrid nanofluid past a nonlinear moving sheet with nonlinear heat sink/source

The utilization of hybrid nanofluids is important in industry because of their high effective thermal conductivity, resulting in high heat transfer rates. The present work examines the influence of nonlinear heat sink/source on forced convective flow induced by Reiner–Philippoff fluid conveying hybrid nanofluid through a moving sheet. Using similarity variables, the PDEs in the current model are transformed into ODEs. Furthermore, the bvp4c approach is used to deal with the dimensionless model. Graphs depict the effects of various physical factors discovered during the scrutiny of numerical simulation on the temperature, heat transfer rate, friction factor, and velocity field. It’s worth noting that increasing the heat source/sink parameters reduces the temperature. Furthermore, increasing the Bingham number parameter increases the temperature and decreases the velocity. A change in the volume fraction parameter augments the temperature and declines the velocity field. The numerical results’ reliability is determined by comparing the acquired results to the existing literature.

Hybrid Microchannel Heat Sink with Sustainable Cooling Solutions: Numerical Model Validation

Miniaturization and utilization of low-dimensional structures of recent electronic devices have witnessed some new micro cooling methods which can fulfil the cooling demand for the electronic devices. Microchannel heat sink (MCHS) is one of the micro cooling method which appears as a promising method that can provide high heat transfer rate due to small hydraulic diameter. Furthermore, microchannel heat sink is easy to be fabricated compare to other micro cooling device. Due to fast development in electronic industry, hybrid microchannel heat sink with optimal design has received a great deal of attention in order to provide sustainable cooling solutions. However, most of the studies of hybrid microchannel heat sink only provided the numerical analysis without any validation of the proposed design experimentally. This is very important since it also will determine whether the proposed hybrid microchannel heat sink can be fabricated or not. Therefore, the aim of this article is to validate the numerical model of hybrid microchannel heat sink (TC-RR-SC MCHS) experimentally. The validation result showed that the maximum discrepancy between both simulation and experimental analyses for Nusselt number and friction factor were 15.8% and 17.4%, respectively, which is less than 20%. The different number of microchannels between the simulated TC-RR-SC MCHS and fabricated TC-RR-SC MCHS is one of the factors that contribute to the data discrepancy. Furthermore, the poor finishing during the fabrication process also another factor because the burrs and debris at the top and bottom surface of microchannels affect the convective heat transfer area and the flow area of fluid.

Design and performance characteristics of a solar box cooker with phase change material: A feasibility study for Uttarakhand region, India

• A low-cost ($55.01) box cooker is especially designed for the people of Uttarakhand region of India. • Thermal performance enhancement is achieved by using aluminum made hollow capsules and encapsulated PCM over the cooking plate. • Encapsulated PCM enhanced the heat transfer rate about 301 W/m°C between cooking plate and cooking stuff. • Cooking power and thermal efficiency are obtained about 53.21 W and 52.10%, respectively. • Feasibility analysis shows the possibility of fair adoption of the tested box cooker in India. In the present work, the thermal performance of a low-cost solar box cooker (SBC) has been improved through the concept of extended fins and heat storage medium. To achieve the goal, about 144 aluminium made small capsule shaped containers have been filled with PCM and placed horizontally over the absorber. Experiments have been conducted on the three different configurations such as, SBC without any modification, SBC with hollow capsules and SBC with an encapsulated PCM. Experimental study mainly emphasizes on a high heat transfer rate and reduced cooking times through the applied modifications. Thermal performance has been found improved by using encapsulated PCM during the cooking trials. Results showed that the last configuration is the best among the three different configurations developed for cooking experiments. Thermal efficiency has been found improved by 52.2%, heat transfer coefficient improved by 301 W/m o C, cooking power enhanced about 53.21 W, and the overall heat loss coefficient reduced about 4.11 W/m o C on the third configuration. The modified SBC purposely designed for the people from hilly regions who are unable to access the clean cooking fuels. Present design is economic ($55.01) and feasible for cooking of common edibles available in Uttarakhand and nearby regions in India. The payback period ranges from 0.80 years to 4.01 years for different fuels. Notified that the modified cooker also meets the Bureau of Indian standards (BIS) developed for solar cookers.

Thermal performance of an ultra-thin flat heat pipe with striped super-hydrophilic wick structure

• The UTFHP with striped super-hydrophilic wick structure was developed. • The mesh number of N = 200 and passage width of P = 1.5 mm is the best wick structure. • The UTFHP could tolerate 8 W heating load with the minimum thermal resistance of 0.26 K/W. The development of high-performance electronic devices requires high heat transfer components with small thickness and high thermal performance. This paper presented an ultra-thin flat heat pipe (UTFHP), and the total thickness and inner height is respectively 0.68 mm and 0.48 mm. The striped-channel structure was developed to withdraw the deformation of UTFHP and reduce the flow resistance. In order to improve the capillary performance of mesh wick, the oxidation treatment was finished by the thermal oxidation method. The thermal performance of UTFHPs was investigated under natural convection cooling condition. The effects of mesh structure, passage width and filling ratio on the thermal resistance and temperature distribution were analyzed. It is found that the UTFHP with mesh number of N = 200 and passage width P = 1.5 mm showed the best thermal performance under the filling ratio of φ = 57%. The minimum thermal resistance was 0.26 K/W with a maximum temperature of 74.07 °C at 8 W heating load, indicating that the proposed UTFHP was able to be a reliable candidate for the thermal management of electronic devices with high heat transfer rates.

Review of the spectrally selective (CSP) absorber coatings, suitable for use in SHIP

A key component in the conversion process of concentrated solar power (CSP) into thermal energy is a solar absorber coating. Many experimental and simulated coatings for various substrates for CSP water/steam or molten salt absorbers have been developed. The main challenges today remain in the selection of a low-cost and effective fabrication method, appropriate for industrial production, and assessment of the degradation rate and service life of these coatings, which affect the efficiency of the plant and the LCOE. In this article, we review different types of mid- (100 < T < 400 °C) and high-temperature (>400 °C) absorber coatings and their fabrication methods. The emphasis is on the solar absorptance, thermal emittance and the long-term (>10 years) thermal stability of the coatings. Spectral selectivity of the coatings, which is more difficult and expensive than other means, was proven to be essential for a low-to-mid temperature range and low concentration ratios, yet for high temperatures and high concentration ratios, high solar absorptive coatings can achieve the same or even better performance than spectral selective ones. Important factors for an efficient CSP absorber are compatibility of the coating and substrate under cyclic temperature conditions and high heat transfer rate to a heat transfer medium.

The entropy generation analysis of the influence of using fins with tip clearance on the thermal management of the batteries with phase change material: Application a new gradient-based ensemble machine learning approach

The present paper deals with 3D numerical analysis of a battery thermal management system (TMS) including the Phase Change Material (PCM). The TSM comprises three annular fins located around the battery considering the tip clearance (TC) space between the fin tips and the alumina enclosure. The calculations were performed for four cases with different TCs (1.5 mm, 1 mm, 0.5 mm, and 0 mm). The entropy generation analysis was performed to determine the locations of the geometry with highest frictional and thermal irreversibilities. The results showed that the application of TC leads to improve the PCM free convection and thereby enhance the heat transfer rate. So that there is an optimum TC (0.5 mm) in which the highest heat transfer rate and lowest PCM melting time is obtained. Moreover, the magnitude of frictional entropy generation rate is much lower than that of the thermal term. For accurate estimation of the liquid fraction, fractional and thermal entropy generation rates, a new ensemble machine learning (ML), namely Gradient Boosting Decision Tree (GBDT), was developed based on the fin tip and flow time parameters as input features. The outcomes of ML-based simulation exhibited promising performance for the precision prediction of three understudy targets.

MHD Ellis nanofluids flow around rotating cone in the presence of motile oxytactic microorganisms

This paper presents novel treatments for the Ellis non-Newtonian nanofluids flow over a rotating cone in the presence of motile oxytactic microorganisms. These treatments are depending on solutions of the stress tensor equations at specific values of the power-law index α (α = 0,0.5,1,2) and introducing the stress as expressions in terms of the velocity gradients. Here, four systems of the governing equations for each value of α are presented and the non-similar forms for these systems are obtained. An efficient finite difference method based on the Blottner technique is applied to solve the converted systems. Various important impacts are examined in these simulations such as, magnetic field, non-linear radiation, viscous dissipation, heat generation and Joule heating. Wide ranges of the non-similar parameters are considered, namely, 0 ≤ ξ ≤ 10, 0 ≤ η ≤ 35. The major results revealed that, the skin friction gets higher values at the Ellis case α = 2 while the Newtonian nanofluids α = 1 gives the highest heat transfer rate. Both the velocity and temperature gradients are diminishing as the bioconvection Rayleigh number is enhanced.

Numerical investigation of heat exchanger pipe equipped with chamfered circular ring separated from wall to intensify thermo-hydraulic performance

Chamfered circular ring (CCR) innovated from conventional circular ring by introducing chamfered surface on its periphery at 30o attack angle is numerically investigated to study its effect on fluid flow characteristics, heat transfer enhancement, and friction factor in a heat exchanger pipe. In order to study flow blockage effect on overall performance of device, three diameter ratios (DR = Di/Do = 0.6, 0.7 and 0.8) with three spacing ratios (SR = s/D = 1, 2 and 3) are used. Turbulent model k – ε, RNG with enhanced wall treatment is used to solve governing equations. Results showed that CCR chamfered surface produced nozzle jet effect on pipe wall surface through clearance of 1 mm, which further induced turbulent and recirculating flow effect near pipe wall area. This resulted into higher heat transfer rate. All the diameter ratios with SR = 1 showed thermal performance factor value more than unity at most of the lower Reynolds number. The range of TPF shown by DR = 0.6, 0.7 and 0.8 with SR =1 is 1.21–0.93, 1.23–0.97, and 1.19–0.99, respectively. Compromised results of TPF are shown by DR = 0.7 and DR = 0.8 at SR = 1. Chamfered circular ring has shown better results over circular ring, perforated conical ring, short length twisted tape, twin co-twisted tape, wire rod bundles, and perforated twisted tape. Numerical results showed better agreement with predicted results within the range of 10%. Highest TPF of 1.23 is shown by DR = 0.7 and SR = 1 at Re 6000.

Numerical scrutinization of dropwise condensation heat transfer on an inclined surface

AbstractRecently, achieving an ameliorated heat transfer rate in dropwise condensation (DWC) has attracted the attention of many researchers. Several parameters, including chemical and physical properties of the substrate, inclination, and interfacial characteristics influence DWC heat transfer rate. The variation of inclination angle is followed by the change in droplet shape and consequently, the heat transfer rate are changed. In this study, the effect of droplet shape variation on diverse inclined substrates is simulated. Moreover, three‐dimensional mass, momentum, and energy equations considering the desired boundary conditions on the unstructured grid are utilized for the scrutinization of flow behavior and heat transfer for static and sliding droplets. For the sake of validation, the outcomes obtained from the simulation were compared with existent data in the literature and a proper agreement was attained. Regarding the outcomes, it was of concern that the influence of inclination angle on the droplet shape is more distinct at higher droplet volume; while no considerable change was seen on heat flux of small droplets by increasing the inclination angle. Furthermore, a higher heat transfer rate was noted by exceeding the inclination angle beyond a definite angle. Additionally, the increased heat transfer rate was affirmed by increasing the Marangoni number .