Abstract
In this study, heat transfer from a moving isothermal hot plate due to double impinging vertical slot jets was investigated for a laminar flow. The rectangular geometry consists of a confining adiabatic wall placed parallel to the moving impingement. The jets are located symmetrically at mid point of upper wall. Water and Al2O3 nanoparticles mixture with different volumetric fraction was used as working medium. In considered jet impingement problem, the effects of the jet exit Reynolds numbers, ranging from 50 to 200, the normalized plate velocity, ranging from 0 to 2, and volumetric fractions of nanofluid, ranging from 0% to 6% were investigated. The commercial software package based on finite volume method FLUENT (version 6.3.26) is used in this study for the computations. It has been observed that increasing normalized plate velocity increases the heat transfer from bottom surface. Similarly, increasing Reynolds number of slot jets leads to enhancement of heat transfer. Besides, increasing volumetric fraction of nanofluid conributes to heat transfer enhancement.
Highlights
The impingement cooling found its use in early 1960’s, especially in the high heat flux region such as in the gas turbine blade [1]
Impinging jets find a vast amount of industrial application areas such as thermal treatment of surfaces, drying of textiles and papers, annealing of glass, cooling of electronic devices, turbine blades and outer walls of combustors
The advantage of impinging jet flow is its ease to adjust the location of interest and to remove a large amount of heat on the impinging surface due to the thin hydrodynamic and thermal boundary layers around the stagnation region
Summary
The impingement cooling found its use in early 1960’s, especially in the high heat flux region such as in the gas turbine blade [1]. Impinging jets find a vast amount of industrial application areas such as thermal treatment of surfaces, drying of textiles and papers, annealing of glass, cooling of electronic devices, turbine blades and outer walls of combustors. High values of the local heat and mass transfer coefficients can be obtained with impinging jets. The advantage of impinging jet flow is its ease to adjust the location of interest and to remove a large amount of heat (or mass) on the impinging surface due to the thin hydrodynamic and thermal (or concentration) boundary layers around the stagnation region. The impinging jet is used as a promising candidate to remove more heat from electrical components [2]. Jet flows can be classified according to their jet number in construction such as single, double or multiple jets [3]
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