Frictional Entropy Generation Research Articles

Investigation into the effects of hydrophobicity on thermohydraulic characteristics and entropy generation of hybrid nanofluid with the magnetic property in a micro-heat sink under a magnetic field

The cooling of devices is a big challenge in the electronics industry, and most process units (graphical are central process units) experience defects under harsh temperature conditions, so dissipating generated heat under various working conditions should be studied seriously. This study investigates the magnetohydrodynamics of hybrid ferro-nanofluids in the presence of hydrophobic surfaces in a micro-heat sink. To scrutinize this study, a finite volume method (FVM) is applied. The ferro-nanofluid includes water as a base fluid and multiwall carbon nanotubes (MWCNTs) and Fe3O4 as nanoadditives, which are used in three concentrations (0, 1, and 3%). Other parameters such as the Reynolds number (5–120), Hartmann number (magnitude of the magnetic field from 0 to 6), and hydrophobicity of surfaces are scrutinized for their impacts on heat transfer and hydraulic variables as well as entropy generation variables. The outcomes indicate that increasing the level of hydrophobicity in surfaces leads simultaneously to improved heat exchange and reduced pressure drop. Likewise, it decreases the frictional and thermal types of entropy generation. Intensifying the magnitude of the magnetic field enhances the heat exchange as much as the pressure drop. It can also decrease the thermal term in entropy generation equations for the fluid, but increase the frictional entropy generation and adds a new term, magnetic entropy generation. Incrementing the Reynolds number improves the convection heat transfer parameters, although it intensifies the pressure drop in the length of the channel. Also, the thermal entropy generation and frictional entropy generation decrease and increase with an increasing flow rate (Reynolds number).

Artificial intelligence-based entropy generation investigation of two-phase nanofluid flow in a heatsink with pin fins

It is crucial to assess the efficiency of using entropy generation (EYG) in energy-consuming devices. In this article, a study is done on the EYG of laminar water/alumina nanofluid (NFD) in a heatsink (HTK) with circular pin fins. The NFD enters the middle of the HTK and exits around it and passes through the pin fins. The bottom portion of the HTK is subjected to a steady flux, and the temperature of the HTK is lowered by the cold NFD. By changing the diameter and height of pin fins and their distance, the values ​​of thermal EYG (TEYG), frictional EYG (FEYG), and total EYG (TOEYG) are estimated and the contours of temperature and NFD flow are presented. An optimization is performed on the results by using the response surface method (RSM) in the range of the studied variables to obtain minimum amounts of EYG and HTK temperature. The finite element method (FEM) and the two-phase mixture method are utilized to simulate the NFD flow. The findings show that increasing the height of the pin fins decreases thermal and TOEYG while increasing FEYG. Enhancing the distance between the pin fins, leads to a slight decrease in thermal and TOEYG.

Control of hybrid nanofluid natural convection with entropy generation: A LBM analysis based on the irreversibility of thermodynamic laws

This article analyzes the irreversibility of the natural convection of water/copper nanofluids in a square enclosure. Thermal entropy generation, frictional entropy generation, and total entropy generation are examined by changing the Hartmann number, thickness and length of baffles, and magnetic field with inclinations angle. Three baffles are mounted on the hot wall of the enclosure. The wall in front of the hot wall is cold and the other walls are insulated. The numerical method is employed for this analysis using the Lattice Boltzmann method. The results of this study demonstrate that an increment in the Ha reduces the horizontal and vertical velocity components ​​of the water/copper nanofluids in the enclosure and reduces the temperature gradient. Also, an enhancement in the Ha reduces all types of ETG. An increment in the angle of the magnetic field enhances thermal entropy generation, frictional entropy generation, and total entropy generation. Enhancing the magnetic field, first decreases and then increases the Bejan number.

Local hydrothermal characteristics and temperature uniformity improvement of microchannel heat sink with non-uniformly distributed grooves

In order to improve the temperature uniformity of bottom walls, a novel design of microchannel heat sink with From-Sparse-To-Dense embowed grooves (MC-FSTD) was proposed as well as a comparative one with From-Dense-To-Sparse embowed grooves (MC-FDTS). The local hydrothermal characteristics and temperature distribution variance of bottom wall of microchannel heat sinks were numerically investigated for Reynolds number (Re) ranging from 100 to 800. The results showed that the denser grooves led to lower flow velocity, lower local friction factor and higher local pressure as well as the lower bottom wall temperature (Tw) and higher local Nusselt number (Nuz). The local Nusselt number and the bottom wall temperature of MC-FSTD were 2.17 times higher and 9.1K lower than that of MC-SC at z = 10 mm, respectively. MC-FSTD also had the most uniform temperature of the bottom wall and the corresponding temperature variance was 6.42 times lower than that of MC-SC at Re = 795.38. The heat transfer entropy generation rate and the total entropy generation rate of MC-FSTD were also the lowest with an acceptable friction entropy generation rate. Finally, the effects of the decreasing magnitude (Li) of the distance between two adjacent grooves on the local hydrothermal characteristics and temperature uniformity of MC-FSTD were explored and the total entropy generation rate was further reduced to 5.22 × 10−4 W/K at Li = 0.015 mm and Re = 795.38.

Numerical analysis of entropy generation in a solar desalination plant with nanofluid and a layer of phase change material in its reservoir

The acquisition of drinking water is discussed in this paper by three-dimensional modeling of a solar desalination plant focusing on renewable energies. The reservoir of the desalination plant contains aluminum nanoparticles with a constant weight percent. A layer of n-Eicosane phase change material (PCM) with various thicknesses is used at the bottom of the desalination plant reservoir. The objective of the present paper is to examine the entropy generation, including frictional, thermal, and total entropy generation in the flow of steam and air inside the desalination plant and the use of the PCM layer. The angle of the glass changes from 10 to 45°, and the thickness of the PCM layer varies during the day. The nanofluid flow is assumed to be two-phase, and the finite element method (FEM) is employed to solve the equations using COMSOL software. The results show that increasing the glass angle enhances the frictional entropy generation, and decreases the thermal entropy generation. Using PCM with a thickness of 50 mm reduces the thermal entropy generation in the steam, especially in the afternoon. The amount of PMC thickness changes the total entropy generation in the PMC.

Comprehensive evaluation of the entropy generation in oval twisted double-pipe heat exchanger using non-Newtonian nanofluid using two-phase mixture model

The aim of this study is to investigate various aspects influencing the entropy production in a twisted double-pipe heat exchanger using two-phase mixture model. A combination of different percentages of CuO nanoparticles (φ=0–3%) in 0.5 wt% Carboxymethyl Cellulose (CMC)-water as a non-Newtonian nanofluid (at 298 K) in the inner tube and water was used as the heating fluid at 308 K at the opposite direction. The simulation outcomes indicated that rising the Re from 500 to 2000 for nanofluid, increased thermal and frictional entropy. On the other hand, raising the φ from 0 to 3% sufficiently lowered the thermal and frictional entropy, which was much more significant in frictional entropy generation rate. For Re=2000, the increase in φ from 0% to 3% caused a decrement in thermal, frictional, and total entropy of 9.2%, 15.3% and 11.8%, respectively. The effect of twisting pitch (2–6 mm) changes on both types of entropy generation also showed that the higher twist pitch resulted in the greater entropy generation, mainly for thermal entropy (24.2%). The results also showed that for all φ, the Bejan number decreased with Re augmentation, and at constant Re, increased with raising φ to some extent.

Investigation of thermal characteristics and entropy generation in a solar collector including Fly Ash-Cu hybrid nanofluids: Numerical approach using mixture model

Heat transfer enhancement is one of the substantial challenges in solar energy conversion systems. By using two different working fluids, namely water and Fly Ash-Cu/water hybrid nanofluids (80:20 Vol.%), this numerical research aims to improve heat transfer by modeling the flat plate solar collector's (FPSC) tube in a zigzag shape instead of a common straight pipe. The innovation of the present study is to evaluate the second law of thermodynamics in a proposed solar collector including Fly Ash-Cu/water hybrid nanofluids and compare the second law of thermodynamics’ results with the Mixture model. Also, various thermal characteristics, such as the Nusselt number, convection heat transfer coefficient (HTC), friction factor, and outlet temperature, are examined at different nanoparticle concentrations, two inlet temperatures, and different mass flow rates. The system works under conjugated laminar mixed convection and constant solar irradiation, 800 W m-2. Results reveal that working fluid pumps with a higher flow rate increase Nusselt number, convection heat transfer coefficient, and friction entropy generation, about 33.33%, 41%, and 88%, respectively, while outlet temperature, friction factor, and thermal entropy generation decrease with increasing mass flow rate. Furthermore, using nanoparticles with a higher concentration considerably increase friction and thermal entropy generation.

Experimental entropy generation, exergy efficiency and thermal performance factor of CoFe2O4/Water nanofluids in a tube predicted with ANFIS and MLP models

The thermal entropy generation, frictional entropy generation, and exergy efficiency of CoFe2O4/water nanofluids flow in a tube have been analyzed experimentally and the obtained data is predicted with ANFIS and MLP algorithms. The CoFe2O4 nanoparticles were developed through the chemical coprecipitation procedure and then characterized with XRD and TEM instruments. The thermophysical properties of CoFe2O4/water nanofluids were analyzed with various instruments in the temperature range from 20 °C to 60 °C and in the volume concentration range from 0.25% to 1.25%, respectively, and then entropy and exergy efficiency experiments were conducted, while the CoFe2O4/water nanofluids flow in a tube. Results show, the thermal entropy generation is lowered by 31.80% and the frictional entropy generation is larger by 240.17%, and the exergy efficiency is higher by 17.58% at φ = 1.25% and at a Reynolds number of 19301, over base fluid. Results also shows, the ANFIS model predicts very high accuracy for the experimental data compared to the MLP-ANN model with a correlation coefficients of 0.99798, 0.9944, and 0.99427 for thermal entropy, frictional entropy and exergy efficiency, respectively. The new thermal entropy, frictional entropy and exergy efficiency correlations were presented from the experimental data.

Effects of the configuration of the delta winglet longitudinal vortex generators and channel height on flow and heat transfer in minichannels

Minichannels with the delta winglet longitudinal vortex generators (LVGs) is commonly used in the heat exchanger. However, there are few studies on the configuration of LVGs on the opposite walls and the large aspect ratio of the channel in the existing literature. In this paper, five LVGs configurations including arrangement on the opposite walls are considered, and four channel heights (1, 2, 4 and 8 mm) are considered to achieve a wide coverage of the channel aspect ratio (0.125–1). In the Reynolds number range of 3000 to 18,000, the effects of LVGs configuration and channel height on flow and heat transfer are obtained by evaluating parameters such as friction factor, Nusselt number, thermal performance factor (TPF), field synergy and frictional entropy generation rate and analyzing the vortex structure displayed by Ω method. The results show that the LVGs configuration and channel height mainly affect the main vortex behavior downstream of LVGs, but have little effect on the vortex structure near LVGs. The Mixed configuration at H = 1 mm and the CFU1 configuration at H = 2 mm have better heat transfer enhancement performance, and their Nusselt numbers are increased by 28–35% and 27–33%, respectively, compared with smooth channels. In addition, the configuration selection aiming at high overall performance under different conditions is given.

Effect of open-ring pin fin arrangement on the thermal performance and entropy generation of a heat sink cooled by biologically synthesized silver-water nanofluid

Thermal performance of a heat sink having open-ring pin fins (ORPF) and cooled by biologically synthesized silver-water nanofluid is explored in terms of first and second laws of thermodynamics within the present work by focusing on the arrangement of ORPFs, namely the in-line and staggered ones. Influences of four different volumetric fractions of nanoparticles (φ=0–1%) and four different Reynolds numbers (Re=500–2000) on the thermal performance and entropy generation behavior of the nanofluid are numerically evaluated. Outcomes revealed that the convective heat transfer coefficient is improved by up to 71% and 19.3% in the in-line, and 65% and 24.7% in the staggered ORPF configurations, respectively, due to the increment in Re and addition of nanoparticles (at Re=500). Moreover, a decline in the pumping power is noticed by adding φ=1% of nanoparticles at Re=1500, compared to base fluid. The pumping power, on the other hand, is increased by 10.5% at Re=2000 and φ=0% when staggered configuration is considered instead of in-line one. Thermal and frictional entropy generation rates are remarkably reduced by incorporation of nanoparticles. In addition, using staggered ORPF arrangement instead of the in-line one can decrease the frictional and thermal entropy generation rates by up to 17% and 4.4%, respectively, at Re=2000.

The effect of inlet velocity profile on entropy generation and hydrothermal performance of a pin-fin heatsink with biologically prepared silver/water nanofluid coolant: Two-phase mixture model

The prediction of heat transfer characteristics numerically depends on several factors such as the numerical method, the boundary and operating conditions, etc. The present paper investigated the influence of using the uniform and non-uniform inlet velocity profiles on the heat transfer coefficient (h), pumping power (W˙p), temperature uniformity (θ), and thermal and frictional entropy generation rates (S˙th and S˙fr) in a pin-fin heatsink with silver/water nanofluid (NF) coolant. The numerical study is conducted utilizing the two-phase mixture scheme. The results proved that h is almost the same for two inlet profiles with the maximum deviation of 0.2%. θ and W˙p, however, for uniform profile is nearly 2.52–1.86% and 15–26% higher than those for the other case at Reynolds numbers of 500–2000, respectively, indicating a lower temperature uniformity and higher power consumption for uniform velocity profile. The figure of merit was obtained as 1.19–1.36 at Re numbers of 500–2000; indicating the better hydrothermal performance of the non-uniform inlet velocity profile over the other case. In addition, S˙th was almost the same for both cases due to same mean temperature and temperature gradients. However, S˙fr for non-uniform profiles was 4.41–8.84% lower than that for other profile at Reynolds numbers of 500–2000.

Predicting entropy generation of a hybrid nanofluid in microchannel heat sink with porous fins integrated with high concentration photovoltaic module using artificial neural networks

This paper evaluates the characteristic of second law of thermodynamic, including Bejan number and entropy generation for hybrid nanofluid containing graphene-silver nanofluid through a MCHS whit porous fins. Finite-volume technique is utilized to solve the governing equations. To simulate the problem, different porous medium thicknesses, nanoparticle concentrations, and inlet mass flow rates are used while the heat flux remains constant. The minimum values of the frictional and thermal entropy generation are 5 × 10−4 and 6.25 × 10−2, while the maximum values are 3.2 × 10−4 and 9.75 × 10−2. With increasing nanoparticle concentration up to 0.06% wt at constant porous thickness tp=200 µm, frictional entropy generation rises up by 3 × 10−5 and heat transfer rate go up while, thermal entropy generation decreases by 1.5 × 10−2. In addition, by doubling the input mass flow rate and reaching 0.02% at constant nanoparticle concentration (0.06%), thermal entropy generation decreases by 2 × 10−2 while the frictional entropy generation increases by 2.4 × 10−4. The minimum magnitude of Bejan number is 0.994. This show that the irreversibility is derived significantly from thermal entropy generation rate. Finally, an artificial neural network is employed to obtain a model for entropy generation.

Impact of cavity tilt angle and magnetic field on the entropy generation of Cu/water nanofluid in a rectangular cavity in the presence of several constant-temperature obstacles

This article examines the convection heat transfer (CHT) of Cu/water nanofluid in a cavity with five high-temperature obstacles. The cavity has a low-temperature moving wall (top wall) and three insulated walls. There is a magnetic field (MGD) close to the cavity. The effect of MGD strength for the Hartmann number (Ha) range of 0 to 40 and the tilt angle range of 0 to 90° on heat transfer (HTR) is evaluated. Also, the impact of these variables on thermal entropy generation (EGN), frictional EGN, and Bejan number (Be) is examined. A FORTRAN code has been developed for the simulations, and the Lattice Boltzmann method (LBM) is used in the numerical solution. The results of this study demonstrate that changing the angle of the MGD has little effect on the Nusselt number (Nu). Up to 8% change in the Nu is seen with the tilt angle change. The maximum and minimum values of the Nu are observed at the tilt angles of 0 and 30°, respectively. As the tilt angle approaches 45°, the EGN is reduced. The field angle of 60° corresponds to the maximum EGN. An increment in the strength of the MGD reduces the EGN, average Nu, and Be in such a way that the enhancement in the Ha from 0 to 40 reduces the Nu, EGN, and Be by 41.9%, 21.8%, and 15.2%, respectively.

Frictional, thermal, and total entropy generation of two-phase nanofluid turbulent flow in a circular heatsink: A numerical study

This article presents a numerical study on entropy generation (ETG), including thermal, frictional, and total ETG of alumina/water nanofluid (NFD) flow in an aluminum heatsink (HSK). The HSK with reciprocating channels is designed to cool seven LEDs. The NFD flow is in a turbulent regime and is analyzed using a two-phase model. The HSK is circular and includes two inlets on two different sides and four outlets on the other two sides. COMSOL software is employed to simulate the HSK. The amounts of pressure and temperature in the HSK channels are estimated. The results demonstrate that frictional ETG changes from 0.17 W/s to 5.37 W/s in the range of studied variables. Frictional ETG is larger than thermal ETG, and as a result, the effect of frictional ETG on total ETG is greater. The maximum and minimum values of total ETG are 5.37 W/s and 0.17 W/s which occur at the maximum and minimum NFD velocities, respectively. The maximum value of thermal ETG corresponds to the smallest dimensions of heat sources and the minimum NFD velocity. The minimum amount of thermal ETG is related to the largest dimensions of heat sources and the maximum NFD velocity.

Thermal improvement of heat exchanger with involve of swirl flow device utilizing nanomaterial

The main objective of this article is to increase the flow mixing within a tube; in this regard, the helical tape with external inserts was developed and studied. CuO based nanofluids was used as a working fluid, and a novel testing fluid model was based on the previous empirical formulation by a three-dimensional (3D) computational fluid dynamic model established for velocity, temperature profiles, exergy, and irreversibility for Reynolds number 5000 and 20,000. The impact of external inserts and Reynolds number were discussed on Nu, f, temperature, and Sgen. The insertion of external inserts increases the Nu and f. When Re increases from 5000 to 20000, Nu increments about 204.21% without external inserts in the twisted tape. For the twisted tapes with external inserts, Nu increases about 202.87%. With external inserts, the entropy generation is reduced to 45% at Re = 5000 and 7% when Re is increased from 5000 to 20,000. An increment in Nusselt number and frictional entropy generation and a reduction in friction factor and thermal irreversibility are observed with an increase in Reynolds number. Consequently, it can be determined that employing nanofluids and twisted tapes in heat exchanger decreases exergy losses and enhance heat transfer performance due to a decrement in thickness of thermal boundary layer.

The entropy generation analysis and optimization of a water/silver nanofluid flow inside a photovoltaic thermal collector considering plain, ribbed, and porous-ribbed absorber tubes

BackgroundThe application of three (a) plain, (b) ribbed and (c) porous-ribbed absorber tube in a PVT solar collector was numerically investigated from the second law of thermodynamic points of view. MethodsThe 3-D laminar forced convection numerical analysis and optimization were performed for Res of 500–2000 and considering water/silver NF with the nanoparticle concentration ratios of 0–2%. Significant findingsThe results showed that the lowest thermal entropy generation rate (S˙th) is associated with the porous-ribbed configuration which is nearly 323% (or 253%) and 1211% (or 1059%) lower as compared to the plain (or ribbed) absorber tube. The moderate frictional entropy generation rate (S˙fr) was obtained for the porous-ribbed configuration which was 23.45% higher and 14.50% lower than that for the plain and ribbed tubes, respectively. The thermal exergy efficiency for the PVT with the porous-ribbed tube was nearly 50% and 46% higher than that with the plain and ribbed absorber tubes, respectively. However, the electrical exergy efficiency of the PVT with the porous-ribbed tube were superior to the ribbed and plain tubes only at low Res of 500 and 1000, while a reverse trend was obtained for the higher Res.

Thermo-fluidic behaviour of diamond and hourglass microchannels: Investigation from the second law viewpoint

The potential of diamond and hourglass microchannels from the second law perspective is explored to amplify the effectiveness of the thermal device for various thermodynamic systems. The chosen design variables cover all relevant physical traits, such as the divergence-convergence effect (divergence-convergence angle, width ratio), geometrical considerations (depth, length), input variables (Reynolds number, supplied heat flux), and conjugate effect (substrate material and thickness). The performance is quantified in terms of thermal and frictional entropy generation, total entropy generation, and augmented entropy generation number. Results reveal that the proposed geometries outperform uniform microchannels for all cases except at higher Reynolds numbers for high divergence-convergence angle, width ratio, length, and low supplied heat flux. The outcome also demonstrates that the diamond microchannel performs slightly better than the hourglass microchannel for all cases except at shorter lengths and higher aspect ratio for Reynolds numbers above 100, owing to flow recirculation zones and the conjugate effect. Additionally, the first and second law attributes of diamond/hourglass microchannels are compared and analyzed. Diamond/hourglass microchannels with superior second law performance at a given design constraint need not exhibit better first law performance simultaneously, and vice versa. Lastly, the current investigation sheds light on design possibilities that enhance the potential of proposed geometries through prudent exploitation of the physical characteristics. The outcomes of this research have the potential to design diamond/hourglass microchannels with the appropriate geometry for a plethora of heat transfer applications.

Thermal performance improvement of a heat-sink using metal foams for better energy storage systems

Newly, energy storage systems and harvesting energy equipment are modern and important topics in engineering problems, but they still face the efficiency problem. Using the advantages of micro-scale flow and metal porous materials can be applied to improve the performance of these systems. So, the present investigation provides a numerical study on a heatsink employing various arrangements of metal foams inside a heat sink (in the direction and against the fluid flow). The influences of diverse fluid flow characteristics, metal foams' permeability and thermophysical properties of the coolant (using CuO-MgO/water nanofluids) on the thermal efficiency of the heatsink are examined. Then, the variations of convective heat transfer coefficient and pressure loss for all variables are investigated, and performance evaluation criteria are defined to distinguish the simultaneous impacts of improving heat exchange against incrementing the pressure loss. It indicates the metal foams located in the direction of the flow perform better than those located against the flow, which increases the performance evaluation criteria (PEC) of the heatsink between 1.18 and 1.55 depending upon the permeability of porous media. Also, using the nanofluids in the presence and absence of metal foams decreases the heatsink performance. Investigating the impacts of volumetric flow rate illustrates that thermal performance increases by increasing the flow rate. In addition, outcomes reveal that although adding metal foams and nano-additives and increasing volumetric flow rate enhance the frictional entropy generation rate, the total amount of entropy generation rate decreases due to more contribution of the thermal entropy generation rate, that reduces by those variables.

Entropy generation analysis on thermo-hydraulic characteristics of microencapsulated phase change slurry in wavy microchannel with porous fins

• Combined design enables smaller temperature gradient and more uniform temperature. • Larger h m and lower ΔP can be concurrently gained in wavy MCHS with porous fins. • Thermal entropy is three orders of magnitude larger than the frictional entropy. • Thermal entropy increases with heat flux but the frictional entropy is opposite. • Lower irreversible losses can be achieved at the cost of higher power consumption. Recent advancement in micro/nano-scale electronic systems, the need for efficient heat dissipation has become more rigorous, and traditional thermal management solutions are facing enormous challenges. In this study, a novel combined design of wavy microchannel heat sink (MCHS) with porous fins and microencapsulated phase change material (MPCM) suspension is developed and numerically studied to achieve a balance between flow and heat transfer behaviors. The equivalent heat capacity method is adopted to deal with the phase change process of microcapsule particles in steady and laminar states, and the Brinkman–Darcy–Forchheimer model based on the volume-averaged method is employed to characterize the fluid flow in porous fins. A three-dimensional solid-fluid conjugate model is established based on the finite-volume method to investigate the effects of different coolant types (water and MPCM suspension), geometric parameters (wavy amplitude, wavelength, and channel width ratio), and working conditions (inlet flow velocity, heat flux, and slurry concentration) on the thermo-hydraulic properties and entropy generation of wavy MCHS. The results reveal that the combination of porous fins and MPCM suspension presents smaller temperature gradient and more uniform temperature distribution than conventional design. Larger heat transfer coefficient and lower pressure drop can be simultaneously obtained in wavy MCHS with porous fins than in solid fin configuration. The thermal entropy generation is three orders of magnitude larger than the frictional entropy generation, and the Bejan number is close to 1 for different microchannel configurations. Thermal entropy generation increases with increasing heat flux but the frictional entropy generation decreases. Lower irreversible losses can be achieved at the expense of greater pumping power consumption caused by increasing inlet velocity and suspension concentration. The superior effect of wavy MCHS with porous fins using MPCM suspension as coolant has been observed in all cases.

Dual Synthetic Jet Actuator and Its Applications—Part IV: Analysis of Heat Dissipation and Entropy Generation of Liquid Cooling with Dual Synthetic Jet Actuator

Increasing heat flux restricts the development of the miniaturization of electronic devices. There is an urgent need for a heat dissipation method that will efficiently cool the chip. This paper presents a novel liquid cooling device based on dual synthetic jets actuator (DSJA) technology. The characteristics of the temperature and velocity field of the device are numerically studied by a three-dimensional coupled heat transfer model. The entropy generation rate caused by heat transfer and fluid friction was studied to analyze the effective work loss and irreversibility of the heat transfer process. When the DSJA is turned on, the temperature of the heat source with a heat flux of 200 W/cm2 is 73.07 ∘C, and the maximum velocity is 24.32 m/s. Compared with the condition when the the DSJA is closed, the temperature decreases by 25.15 ∘C, and the velocity increases by nearly 20 m/s. At this time, the total inlet flow is 1.26 L/min. The larger frictional entropy generation is mainly distributed near the inlet and outlet of the channel and the jet orifice. The higher the velocity is, the more obvious the frictional entropy generation is. Due to the large temperature gradient, there is a large thermal entropy generation rate at the fluid–solid interface.