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流动显示和图像处理期刊
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN 打印: 1065-3090
ISSN 在线: 1940-4336

流动显示和图像处理期刊

DOI: 10.1615/JFlowVisImageProc.2018027508
pages 277-295

THERMAL VISUALIZATION AND PERFORMANCE EVALUATION OF THE OPEN MATRIX STRUCTURES USING LIQUID CRYSTAL THERMOGRAPHY

Anjana Prajapati
AVTAR (Aerodynamics Visualization and Thermal Analysis Research) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India
Andallib Tariq
Aerodynamics Visualization and Thermal Analysis Research (AVTAR) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Uttarakhand-247667, India

ABSTRACT

In many applications such as gas turbine blade cooling, compact heat exchangers, electronic device cooling and solar duct air heaters, the heat transfer enhancement is of prime importance. The matrix structures have shown their potential to adopt it as an alternative cooling technique over conventional techniques such as rib turbulators, pin-fin cooling, etc. due to their distinct advantage of structural rigidity along with higher thermal performances. The objective of the present investigation is to measure and compare the thermal performance of open matrices with a closed (regular) matrix placed in a rectangular duct, which closely represents the middle region of the gas turbine blade. Experiments have been conducted in a stationary duct fitted with matrix structures with ribs at an angle of 45° to the flow direction carrying open slots at both side walls. While maintaining the subchannel aspect ratio ARs = 0.8 constant, the open matrix gap is varied as 2, 4, and 6 mm on both side walls, and a study has been carried out for the Reynolds number range from 5800 to 14,000 using liquid crystal thermography. Results are presented in terms of Nusselt number enhancement and friction factor ratio with respect to a smooth duct. Open matrices with gaps on both sides showed lower heat transfer enhancement accompanied with reduction in pressure drop as compared to a closed matrix. The maximum heat transfer enhancement and thermal performance factor achieved are respectively 4.94 and 1.19 for a closed matrix. The friction factor is reduced as the slot gap and the Reynolds number increases.


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