Visualization of flow and heat transfer characteristics for swirling impinging jet

被引：68

作者：

Nuntadusit, C. ^{[1
,2
]}

Wae-hayee, M. ^{[1
,2
]}

Bunyajitradulya, A. ^{[3
]}

Eiamsa-ard, S. ^{[4
]}

机构：

[1] Prince Songkla Univ, Energy Technol Res Ctr, Hat Yai 90112, Songkhla, Thailand

[2] Prince Songkla Univ, Dept Mech Engn, Fac Engn, Hat Yai 90112, Songkhla, Thailand

[3] Chulalongkorn Univ, Dept Mech Engn, Fac Engn, Bangkok 10330, Thailand

[4] Mahanakorn Univ Technol, Dept Mech Engn, Fac Engn, Bangkok 10530, Thailand

来源：

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER | 2012年 / 39卷 / 05期

关键词：

Heat transfer enhancement; Impinging jet; Swirling jet; Flow visualization; Twisted tape; Thermochromic liquid crystal; TWISTED-TAPE INSERTS; FLAT SURFACE; TUBE; IMPINGEMENT; PRESSURE; FRICTION; LAMINAR; WALL;

D O I：

10.1016/j.icheatmasstransfer.2012.03.002

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Flow and heat transfer characteristics of swirling impinging jet (SIJ) were studied experimentally at constant nozzle-to-plate distance of L = 4D. The swirling jet is generated by inserting twisted tapes within a pipe nozzle. Effects of swirl on the impinged surface are investigated at twist ratios (y/W) of infinity (straight tape), 3.64, 2.27, 1.82, and 1.52. The flow patterns of the free swirling jet and the swirling impinging jet were visualized by mixing dye with the jet flow. Distributions of temperature and convective heat transfer coefficient on the impinged surface were measured with thermochromic liquid crystal (TLC) sheet and image processing technique. Additionally, an oil film technique was performed as a complementary technique for flow visualization on the impinged surface. The experimental results reveal that there appear to be two peaks of heat transfer in the jet impingement region. The heat transfer enhancements in jet impingement region can be achieved at a low twist ratio of 3.64 which corresponds to the swirl number of 0.4. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：640 / 648

页数：9

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