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Heat Exchangers

An Experimental and Numerical Investigation on the Thermal-Hydraulic Performance of Double Notched Plate

[+] Author and Article Information
Lei Zhang

State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering,  Xi’an Jiaotong University, Xi’an 710049, Chinadfche@mail.xjtu.edu.cn

Defu Che1

State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering,  Xi’an Jiaotong University, Xi’an 710049, Chinadfche@mail.xjtu.edu.cn

1

Corresponding author.

J. Heat Transfer 134(9), 091802 (Jul 02, 2012) (7 pages) doi:10.1115/1.4006210 History: Received June 14, 2011; Revised February 13, 2012; Published July 02, 2012; Online July 02, 2012

The double notched (DN) plate is commonly used in rotary air preheaters, but relevant investigations are rare. Thus, thermal-hydraulic performances of the DN plate are investigated in this paper. A single-blow, transient technique is refined and then used to measure the overall mean heat transfer coefficients and friction factors. A validated numerical method is also utilized to provide local information. The measured results show that the performance of the DN plate approaches that of the double undulated (DU) plate and lies between that of the cross corrugated (CC) plate and the parallel plate. No swirling flow pattern is identified in the predicted velocity fields. Basically, two types of flow are observed: wavy channel flow and pipe flow. High or low Nusselt numbers, Nu, are obtained at the luff or lee side of undulations and notches, respectively. Nu values increase and Nu distributions become more homogenous with increasing Reynolds numbers, Re. A recommendation is made that the DN plate be operated under moderate Re to achieve homogenous and enhanced heat transfer, given the allowable pressure drop.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 11

(a) In-plane velocity fields and (b) the corresponding temperature fields

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Figure 10

(a) In-plane velocity fields and (b) temperature fields in the section O–O

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Figure 9

In-plane velocity fields in the section N–N

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Figure 8

Experimental and numerical j and f values

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Figure 7

Unstructured grids for a DN plate

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Figure 6

Current versus previous f data

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Figure 5

Current versus previous j data

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Figure 4

Experimental data processing for Re = 4709

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Figure 2

(a) DN plate test core and (b) energy balance inside a control volume

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Figure 1

The DN plate geometry: (a) end view, (b) perspective view, and (c) top view

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Figure 12

Distributions of the Nusselt number on the bottom wall

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Figure 13

Spanwise Nusselt number distributions

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