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Research Papers: Jets, Wakes, and Impingement Cooling

Measurement and Modeling of Confined Jet Discharged Tangentially on a Concave Semicylindrical Hot Surface

[+] Author and Article Information
Mohammad O. Hamdan1

Mechanical Engineering Department,  United Arab Emirates University, P.O. Box 17555, Al-Ain, Abu Dhabi, United Arab EmiratesMohammadH@uaeu.ac.ae

Emad Elnajjar, Yousef Haik

Mechanical Engineering Department,  United Arab Emirates University, P.O. Box 17555, Al-Ain, Abu Dhabi, United Arab EmiratesMohammadH@uaeu.ac.ae

1

Corresponding author.

J. Heat Transfer 133(12), 122203 (Oct 07, 2011) (7 pages) doi:10.1115/1.4004529 History: Received October 28, 2010; Revised June 27, 2011; Published October 07, 2011; Online October 07, 2011

The paper investigates experimentally and numerically the heat transfer augmentation from a semicircular heated surface due to confined slot-jet impingement. For different Reynolds numbers, the average and local Nusselt numbers are calculated by reporting the heater thermal image obtained by an infrared camera, the inlet and outlet flow temperature via thermocouples, the flow rate via rotameter, and the pressure drop across the inlet and outlet flow via pressure transducers. The single enclosed jet flow is used to create a single cyclone inside the internal semicircular channel to promote the heat transfer at different jet Reynolds numbers (Rejet  = 1000–5000). Three turbulence models, namely, the standard k – ɛ, k – ω and the Reynolds stress model (RSM) have been investigated in the present paper by comparing Nusselt number and normalized pressure drop distribution against the experimental data, helping ascertain on the relative merits of the adopted models. The computational fluid dynamics results show that the RSM turbulent model reasonably forecast the experimental data.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental apparatus setup with main collected experimental data

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Figure 2

A schematic diagram of the CFD model (cross section A-A) and the boundary conditions with a sample mesh

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Figure 3

Grid refinement showing the convergence of the local Nusselt number for the impingement curved surface for Rejet  = 3570 using the three turbulence models (a) RSM, (b) k – ɛ, and (c) k– ω

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Figure 4

A top view thermograph of the curved surface heater at Rejet  = 3570 and a uniform curved wall heat flux of 1270 W/m2

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Figure 5

The variation of the average Nusselt number versus the jet Reynolds number

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Figure 6

The variation of the normalized pressure drop versus the jet Reynolds number

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Figure 7

The local surface temperature of the curved surface obtained at cross section A-A with Rejet  = 3570 and a uniform curved wall heat flux of 1270 W/m2

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Figure 8

The local Nusselt number for the curved surface calculated at section A-A with Rejet  = 3570 and a uniform curved wall heat flux of 1270 W/m2

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Figure 9

(a) The streamlines contours and (b) the isotherms contours for Rejet  = 3570 and a uniform curved wall heat flux of 1270 W/m2

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