1Centre for Energy Studies, JNTU College of Engineering Hyderabad-500034, India, E-mail address:
2Department of Mechanical Engineering, SNIST, Hyderabad. India
3Centre for Energy Studies, JNTU College of Engineering, Hyderabad. India
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An experimental investigation is performed to study the effects geometric parameters on the confined impinging jet flow field and heat transfer characteristics of an array of electronic resistors with three different nozzle cross-sections, viz. square, rectangular, and circular each with different an equivalent diameter are used during this study. The effect of Reynolds number and aspect ratio H/d, on Nusselt number has been studied. Measurement of surface temperatures of the resistors is made in the range of 6500 < Red < 12500 and 2 < H/d <10 and heat transfer coefficients evaluated. Local and stagnation Nusselt number on the impinged resistor surface are presented for all the nozzle configurations investigated, and Local heat transfer rate at a fixed radial location and stagnation Nusselt number for different r/d ratios were correlated and compared with the data of earlier investigators.
Jet impingement, shape of the nozzle, Local heat transfer, Electronic Cooling
