Jet impingement cooling on a rib-roughened surface using extended jet holes

被引：55
作者：
Tepe, Ahmet Umit [1 ]
Uysal, Unal [2 ]
Yetisken, Yasar [3 ]
Arslan, Kamil [3 ]
机构：
[1] Kastamonu Univ, Abana Sabahat Mesut Yilmaz Vocat Sch, TR-37970 Kastamonu, Turkey
[2] Sakarya Univ, Fac Engn, Mech Engn Dept, TR-54050 Sakarya, Turkey
[3] Karabuk Univ, Fac Engn, Mech Engn Dept, TR-78050 Karabuk, Turkey
来源：
APPLIED THERMAL ENGINEERING | 2020年 / 178卷 / 178期
关键词：
Rib-roughened surface; Jet impingement cooling; Turbine blade cooling; Convective heat transfer; HEAT-TRANSFER CHARACTERISTICS; NUMERICAL INVESTIGATIONS; FLOW; FLAT; WALL; DUCT;
D O I：
10.1016/j.applthermaleng.2020.115601
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
In this study, jet impingement cooling on a rib-roughened surface has been investigated experimentally. The aim of this study is to investigate the effect of extended jet holes on the heat transfer performance and flow characteristics of the jet impingement cooling on a rib-roughened surface. The studies have been conducted under turbulent flow condition (16,250 <= Re-j <= 32,500). Transient Liquid Crystals (TLC) method has been employed to investigate the average and local Nusselt number (Nu) distributions on the surface of interest. Six inline arrays of jet impingement configuration have been examined as the jet impingement cooling system. Jet holes were extended towards the target surface with the nozzles. Various dimensionless nozzles to the target surface gaps (G(j)/D-j = 1.0, 2.0, 3.0, 4.0 and 5.0) have been investigated. Rectangular cross-sectional ribs were located on the surface of interest for the augmentation of heat transfer. Experimental studies were conducted on the dimensionless rib height as H-r/D-j = 0.42. In addition, numerical studies were carried out to investigate the flow and heat transfer characteristics. The effect of various dimensionless rib heights (H-r/D-j) on convective heat transfer performance has also been investigated numerically. SST k-omega with low-Re correction turbulence model was used for solving turbulence equations. Average and local Nu number distributions, flow characteristics and Performance Evaluation Criterion (PEC) were examined in detail. Results were compared with the orifice plate (G(j)/D-j = 6.0) jet impingement configuration. Results showed that SST k-omega turbulence model accurately reveals the experimental data. Application of extended jet holes is a feasible method for practical application of the jet impingement cooling, especially at relatively low dimensionless nozzle gap (G(j)/D-j <= 4.0). Furthermore, improperly designed rib height has been found to diminish heat transfer performance.
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页数：12
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