Measurements of Local Nusselt Number with a Miniscale Laminar Confined Slot-Jet Impinging on a Flat Plate

被引：2

作者：

Lee, Dae Hee ^{[1
]}

Trainer, Daniel ^{[2
]}

Lee, Jun Sik ^{[3
]}

Park, Hyun Jin ^{[3
]}

机构：

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

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

[3] Inje Univ, Grad Sch Mech Engn, Gimhae 621749, Gyeongnam, South Korea

来源：

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2011年 / 50卷 / 10期

关键词：

HEAT-TRANSFER; FLOW; IMPINGEMENT; CHANNEL; GAS;

D O I：

10.1021/ie101738y

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Heat transfer characteristics in a miniscale laminar confined slot-jet on a heated plate at uniform heat flux are experimentally investigated. The effects of the jet Reynolds number (Re = 120-180) on the heat transfer and flow are considered. An electrically heated gold film Intrex (a very thin gold-coated polyester substrate sheet) is used to create a uniform heat flux on the flat surface. The temperature on the surface is measured by thermochromic liquid crystals and a digital color image processing system. Recorded color images of liquid crystals are then used to determine the local Nusselt numbers along the surface. The results show a peculiar behavior in that the Nusselt number increases between Re = 120 and Re = 140, suddenly drops at around Re = 150-160, and increases again beyond Re = 160. This sudden drop of Nusselt number at around Re = 150-160 may be caused by a sinusoidal fluctuation of the jet flow.

引用

页码：6508 / 6512

页数：5

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