Abstract:A new micro heat exchanger was analyzed using numerical formulation of conjugate heat transfer for single-phase fluid flow across copper microchannels. The flow across bent channels harnesses asymmetric laminar flow and dean vortices phenomena for heat transfer enhancement. The single-channel analysis was performed to select the bent channel aspect ratio by varying width and height between 35–300 μm for Reynolds number and base temperature magnitude range of 100–1000 and 320–370 K, respectively. The bent chann… Show more
“…Many researchers around the world have focused nanofluids as they provide the possibility of increased heat transfer for various purposes including cooling of thermal power plants, electronics, manufacturing and transportation. Most of the nanofluids’ works as heat transfer fluid (HTF) have concentrated on utilizing typical 2D nanoparticles such as graphene or conventional nanoparticles namely copper, silver, gold, aluminum oxide, copper oxide and silicon carbide [ 1 , 2 , 3 , 4 ]. For example, Wang et al [ 5 ] showed a thermal conductivity enhancement of 14.2% using graphene nanoparticles in ethylene glycol base fluid.…”
Since technology progresses, the need to optimize the thermal system’s heat transfer efficiency is continuously confronted by researchers. A primary constraint in the production of heat transfer fluids needed for ultra-high performance was its intrinsic poor heat transfer properties. MXene, a novel 2D nanoparticle possessing fascinating properties has emerged recently as a potential heat dissipative solute in nanofluids. In this research, 2D MXenes (Ti3C2) are synthesized via chemical etching and blended with a binary solution containing Diethylene Glycol (DEG) and ionic liquid (IL) to formulate stable nanofluids at concentrations of 0.1, 0.2, 0.3 and 0.4 wt%. Furthermore, the effect of different temperatures on the studied liquid’s thermophysical characteristics such as thermal conductivity, density, viscosity, specific heat capacity, thermal stability and the rheological property was experimentally conducted. A computational analysis was performed to evaluate the impact of ionic liquid-based 2D MXene nanofluid (Ti3C2/DEG+IL) in hybrid photovoltaic/thermal (PV/T) systems. A 3D numerical model is developed to evaluate the thermal efficiency, electrical efficiency, heat transfer coefficient, pumping power and temperature distribution. The simulations proved that the studied working fluid in the PV/T system results in an enhancement of thermal efficiency, electrical efficiency and heat transfer coefficient by 78.5%, 18.7% and 6%, respectively.
“…Many researchers around the world have focused nanofluids as they provide the possibility of increased heat transfer for various purposes including cooling of thermal power plants, electronics, manufacturing and transportation. Most of the nanofluids’ works as heat transfer fluid (HTF) have concentrated on utilizing typical 2D nanoparticles such as graphene or conventional nanoparticles namely copper, silver, gold, aluminum oxide, copper oxide and silicon carbide [ 1 , 2 , 3 , 4 ]. For example, Wang et al [ 5 ] showed a thermal conductivity enhancement of 14.2% using graphene nanoparticles in ethylene glycol base fluid.…”
Since technology progresses, the need to optimize the thermal system’s heat transfer efficiency is continuously confronted by researchers. A primary constraint in the production of heat transfer fluids needed for ultra-high performance was its intrinsic poor heat transfer properties. MXene, a novel 2D nanoparticle possessing fascinating properties has emerged recently as a potential heat dissipative solute in nanofluids. In this research, 2D MXenes (Ti3C2) are synthesized via chemical etching and blended with a binary solution containing Diethylene Glycol (DEG) and ionic liquid (IL) to formulate stable nanofluids at concentrations of 0.1, 0.2, 0.3 and 0.4 wt%. Furthermore, the effect of different temperatures on the studied liquid’s thermophysical characteristics such as thermal conductivity, density, viscosity, specific heat capacity, thermal stability and the rheological property was experimentally conducted. A computational analysis was performed to evaluate the impact of ionic liquid-based 2D MXene nanofluid (Ti3C2/DEG+IL) in hybrid photovoltaic/thermal (PV/T) systems. A 3D numerical model is developed to evaluate the thermal efficiency, electrical efficiency, heat transfer coefficient, pumping power and temperature distribution. The simulations proved that the studied working fluid in the PV/T system results in an enhancement of thermal efficiency, electrical efficiency and heat transfer coefficient by 78.5%, 18.7% and 6%, respectively.
“…Flow on the micro-scale exhibits dissimilar properties from the flow on the macro scale; albeit, some disagreements amongst researchers exist regarding this. Nevertheless, the governing equations used for modelling the simulation of the novel heat sinks and standard k-epsilon flow turbulence assumptions were adapted from previous works [5], [6].…”
Pin-fins are effective strategies to enhance heat sink performance; moreover, bio-inspired designs present endless geometrical potential. In this work, a comparative investigation of two biomorphic pin-fin-based heat sinks was carried out via ANSYS CFD simulations. The results showed that the heat transfer performance of the pentagonal and sharp-edged design reported approximately 14% higher Nusselt number compared to a circular and smoother-edged design. Furthermore, the pressure drops or variations within both heat sinks were minimal. The findings from this research provide a baseline for future bio-inspired heat sink designs and heat transfer improvement strategies.
“…Qiu et al [2,3] used porous copper as a substrate to prepare microchannel radiators with excellent heat dissipation capabilities, which allowed device temperatures to be reduced from 85℃ to 59℃ when using the optimal combination of pore size and porosity. Some researchers added different radiators [4] and nanoparticles [5] with different particle shapes to the coolant to form different nanofluids in place of water as the coolant that enhanced the heat transfer with obvious effect. Still, these methods greatly increased the difficulty of microchannel manufacturing and material costs.…”
This paper presents the design of a cooling device for microelectronic device applications. The proposed device uses parallel plate capacitor electrical bias to generate an electrostatic force that acts on the coolant to enable control of the coolant flow in the radiator. Through a combination of the structural design of the device and the application of an electrical bias on both sides of multiple parallel plate capacitor electrodes, the generation of a radiator coolant eddy current is realized, and the functions of cooling and heat transfer are realized for microelectronic devices placed on the surface of the base platform. Based on this principle, a finite element multi-physical field simulation was used to simulate the flow heat transfer function of the coolant in the device under the action of the electrostatic force and the effects of the channel diameter, channel spacing, voltage, and liquid storage tank depth on the peak coolant velocity were studied. In addition, 3D printing technology was used to fabricate the heat dissipation device. The heat dissipation device was tested by charging, with a basic realization of the function of controlling the cooling liquid flow in the heat dissipation device demonstrated. The device realizes radiator coolant flow rate control through voltage control and has characteristics that include low energy consumption and a convenient and compact structure.
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