Heat transfer characteristics of a micro-scale impinging slot jet

被引：47

作者：

Choo, Kyo Sung ^{[1
]}

Youn, Young Jik ^{[1
]}

Kim, Sung Jin ^{[1
]}

Lee, Dae Hee ^{[2
]}

机构：

[1] Korea Adv Inst Sci & Technol, Sch Mech Aerosp & Syst Engn, Taejon 305701, South Korea

[2] Inje Univ, Sch Mech & Automot Engn, High Safety Vehicle Core Technol Res Ctr, Gimhae 621749, South Korea

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2009年 / 52卷 / 13-14期

基金：

新加坡国家研究基金会;

关键词：

AIR-JET; GAS;

D O I：

10.1016/j.ijheatmasstransfer.2009.02.015

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In the present study, heat transfer characteristics of a micro-scale slot jet impinging on a heated flat plate are experimentally investigated. The effects of Reynolds numbers (Re = 150-5000) and nozzle-to-plate spacings (Z/d(h) = 0.5-10) on the Nusselt number are considered. Based on the experimental results, correlations on the stagnant and average Nusselt numbers for the micro-scale impinging slot jet are developed as a function of Reynolds number and nozzle-to-plate spacing. At Reynolds numbers (Re < 2500), different from the existing results, the present study shows that the heat transfer characteristics of the microscale impinging slot jet are similar to those of the macro-scale impinging slot jet. However, at Reynolds numbers (Re >= 2500), the present study shows that the heat transfer characteristics of the micro-scale impinging slot jet are different from those of the macro-scale impinging slot jet. Firstly, a maximum local Nusselt number occurs at a shifted peak of about x/d(h) = 1.75 under the condition of large nozzle-to-plate spacing (Z/d(h) > 1), rather than at the stagnation point. Secondly, the effect of the nozzle-to-plate spacing on the Nusselt number is significant. The exponent on Reynolds number is the function of nozzle-to-plate spacing Nu proportional to Re-f(Z/dh), rather than a constant value. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.

引用

页码：3169 / 3175

页数：7

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