Effects of jet plate size and plate spacing on the stagnation Nusselt number for a confined circular air jet impinging on a flat surface

Glass tempering heat transfer coefficient evaluation and air jets parameter optimization

“…Moreover, effusion holes allow a more uniform cooling of the impinged surface and increase the average heat transfer coefficient as small values of the jet to plate distance are used. Another simple equation, which correlate the stagnation Nusselt number with Re number and H/D for a confined circular air jet impinging on a flat plate, is supplied by Jung-Yang San and Wen-Zheng Shiao (8). They performed a series of experiments investigating the influence of the jet to plate distance H/D and plate dimensions on the stagnation Nusselt number.…”

Impingement heat transfer of staggered arrays of air jets confined in a channel

“…In this work, the experimental apparatus and procedure are much the same as those in previous work [3,6,21]. Fig.…”

“…An electric current, supplied by an Agilent E3610A DC power supply unit, was arranged to flow through the heating foils to generate a uniform surface heat flux. The detailed wiring of the heating foils can be found in an earlier published paper [6]. In measurement of the stagnation Nusselt number of the center jet, two removable rectangular bars were carefully placed on the two outer edges of the heated foils (along the x-axis) to form a channel between the jet plate and impingement plate.…”

“…Yang and Wang [5] used the k-e turbulence model to show a pair of rotating vortices in a channel for a flow with an inclined impinging jet. San and Shiao [6] successfully expressed the stagnation Nusselt number for a confined impinging jet as a function of jet Reynolds number, jet height-to-jet diameter ratio, jet plate lengthto-jet diameter ratio and jet plate width-to-jet diameter ratio.…”

Fluid flow and convective heat transfer of combined swirling and straight impinging jet arrays

“…In addition, flow confinement forces the upward flow to escape laterally, leading to a very complex flow pattern, highly dependent on the array stencil. In other works, San and Shiao (2006) and San et al (2007), proposed correlations between stagnation point Nusselt number and relevant parameters for a confined circular air jet impinging on a smooth surface. More recently, San and Chen (2014), studied the effect of cross flow, jet interaction and jet interference on heat transfer distribution for five confined circular air jets impinging on a flat plate.…”