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Showing papers by "Richard J Goldstein published in 2004"


Journal ArticleDOI
TL;DR: In this paper, the average heat transfer in each region is calculated and correlated with the Reynolds number and the Prandtl number, and an empirical correlation for predicting the overall heat transfer from the cylinder is developed from the contributions of heat transfer.

146 citations


Journal ArticleDOI
TL;DR: In this article, the authors investigated the local heat transfer characteristics of flow through perforated plates and found that the transfer rate is dominated by the target (second) surface (approximately 50%) instead of the inside hole surface that is dominant with a single plate case.
Abstract: The present study investigates the local heat (mass) transfer characteristics of flow through perforated plates. Two parallel perforated plates placed, relative to each other, in either staggered, in-line or shifted in one direction. Hole length to diameter ratio of 1.5, hole pitch to diameter ratio of 3.0, and distance between the perforated plates of 1 to 3 hole diameters are used at hole Reynolds numbers of 3,000 to 14,000. For flows through the staggered layers and the layers shifted in one direction, the mass transfer rates on the windward surface of the second wall increase approximately 50% from impingement cooling alone and are about three to four times that with effusion cooling alone (single perforated plate). The high transfer rate is induced by strong secondary vortices formed between two adjacent impinging jets that are accelerated by the effusion flow. The overall transfer rate is dominated by the target (second) surface (approximately 50%) instead of the inside hole surface that is dominant with a single plate case. The transfer coefficient for the in-line layers is approximately 100% higher on the windward surface of the second wall than that of the single plate case. The transfer coefficient on the leeward surface for the second plate is affected little by upstream flow conditions.Copyright © 2004 by ASME

54 citations


Journal ArticleDOI
TL;DR: In this article, the influence of Reynolds number and Prandtl number on the distributions of local Nusselt number around a circular cylinder in crossflow is described, where the working fluids are water and mixtures of ethylene glycol and water.

40 citations