Modeling of nucleate boiling heat transfer of a stagnation-point flow impinging on a hot surface

Abstract

A model using modified superposition approach is developed to predict the rate of heat transfer in the stagnation region of a planar jet impingement boiling on a hot flat surface. The total heat flux in this model is based on the combination of the single phase forced convection and nucleate pool boiling components. The single-phase component is calculated by using similarity solution approach. The applicability of the model is investigated on the boiling curves under conditions of single-phase, partial, and fully developed nucleate boiling. The effect of main parameters of water jet, i. e. jet sub-cooling, jet velocity, and nozzle to plate distance on the heat flux, is of concerned. A comparison of the obtained results of the model is made with various published experimental data and good agreement is reported.

A New Correlation for the Onset of Nucleate Boiling Heat Flux under an Impinging Planar Water Jet

“…h . In the previous work [6], the heat transfer coefficient was analytically calculated by similarity solution as:…”

“…Jet impingement boiling (JIB) is an effective technique for cooling applications such as cooling of hot rolling steel strip, coplanar computer chips and power electronics due to extracting a high heat flux concentrated at stagnation region and its neighbourhood. Hence, it has been under numerous studies in few last years, e.g., [1][2][3][4][5][6][7]. A review study of the jet impingement boiling has been carried out by Wolf et al [8].…”

“…Nozzle configuration and velocity field of a planar free surface jet[6].Depending on the surface temperature, different heat transfer regimes are observed. When the surface temperature;s T below the required temperature for initial vapor bubble nucleation, i.e.…”

Numerical study on heat and mass transfer behavior of pool boiling in LiBr/H2O absorption chiller generator considering different tube surfaces

“…Several studies have been carried out to examine the pool boiling effects in different engineering areas. These studies have focused on the horizontal falling film absorber [9,10], the boiling heat transfer coefficient in mechanical refrigeration systems [11], the desorption and nucleate boiling in a droplet of LiBr/H 2 O solution to check how an increase in the salt concentration of a liquid-layer may lead to a significant decrease in the rate of desorption [12,13], and the process of stationary evaporation of aqueous solutions [14,15]. Concerning previous literature, the pool boiling process in the absorption chiller generator might be enhanced by improving the useful parameters, causing an increase in the COP of the chiller.…”