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

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• 作者：Dae Hee Lee ; Daniel Trainer ; Jun Sik Lee ; Hyun Jin Park
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：May 18, 2011
• 年：2011
• 卷：50
• 期：10
• 页码：6508-6512
• 全文大小：742K
• 年卷期：v.50,no.10(May 18, 2011)
• ISSN：1520-5045

文摘

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鈥?80) 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鈥?60, and increases again beyond Re = 160. This sudden drop of Nusselt number at around Re = 150鈥?60 may be caused by a sinusoidal fluctuation of the jet flow.