Abstract
In this paper heat transfer during impingement of an array of 8×8 microjets on a hot surface was investigated. The influence of a ratio of a distance between a nozzle and hot plate (H/d) and microjet diameter-based Reynolds number (Red) on the temperature and heat transfer coefficient (HTC) on the hot plate were numerically studied. The numerical model which was based on the steady-state compressible Navier-Stokes equations and SST k-ω turbulence model was developed and applied for the analysis. During simulations the ratio of the distance between the nozzle and hot plate to the microjet diameter was H/d = 3.125, 25 and 50, while the microjet diameter-based Reynolds number was equal to Red = 690, 1100 and 1510. The ratio of the microjet pitch to the microjet diameter was s/d = 31.25. It was found that both the H/d ratio and Red significantly influenced flow patterns in the gap between the nozzle and hot plate as well as the temperature and HTC on the surface of the hot plate. With increase of the H/d ratio a more uniform distributions of the plate temperature and HTC were observed, while the rise in the Red intensified heat transfer on the hot plate.
Highlights
The microjet impingement is gaining attention as it has large potential for applications in cooling technologies for miniaturized devises [1], e.g., in electronics
In the case of impingement of miniaturized jets or microjets several experimental and numerical works were conducted. These investigations concentrated on both characterization of heat transfer and fluid flow during microjet impingement [10] as well as investigation of performance of devices based on the microjet impingement technology, e.g., cooling system of gas turbine blade [11], silicon-based heat sink for electronic applications [12], modular heat exchanger [13] and cooling system integrated within an electronic devices [14]
Numerical simulations were performed for three values of the ratio of the distance between the nozzle and hot plate to the microjet diameter, i.e., H/d = 3.125, 25 and 50 as well as for three values of the microjet diameterbased Reynolds number, i.e., Red = 690, 1100 and 1510
Summary
The microjet impingement is gaining attention as it has large potential for applications in cooling technologies for miniaturized devises [1], e.g., in electronics It is very efficient transport phenomenon which offers very high heat and mass transfer rates on an impinged surface. In the case of impingement of miniaturized jets or microjets several experimental and numerical works were conducted These investigations concentrated on both characterization of heat transfer and fluid flow during microjet impingement [10] as well as investigation of performance of devices based on the microjet impingement technology, e.g., cooling system of gas turbine blade [11], silicon-based heat sink for electronic applications [12], modular heat exchanger [13] and cooling system integrated within an electronic devices [14].
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