Library Subscription: Guest
Begell Digital Portal Begell Digital Library eBooks Journals References & Proceedings Research Collections
Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v9.i2-3.80
18 pages

EFFECTS OF GAPS BETWEEN THE SIDE-WALLS AND RIBS ON THE RIB-INDUCED FLOW STRUCTURE AND HEAT TRANSFER DISTRIBUTION INSIDE A HIGH ASPECT RATIO COOLING CHANNEL

Robert Kiml
Tokyo University of Agriculture and Technology, Department of Mechanical Systems Engineering, Koganei-shi,Nakacho 2-24-16,Tokyo 184-8588, Japan
Sadanari Mochizuki
Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei-shi, Tokyo 184, JAPAN
Akira Murata
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan

ABSTRACT

The flow visualization and heat transfer experiments were performed in a rectangular test section with an aspect ratio of 5:1, representing a cooling channel inside a trailing edge of a gas turbine rotor blade. The experiments were performed for three 60° ribs arrangements: 1) 60° full ribs, 2) 60° ribs with the gaps between the Rear wall and ribs and 3) 60° ribs with gaps between the Front wall and ribs. The obtained results showed strong effects of the rib-induced secondary flow on the heat transfer distribution. It was revealed that the heat transfer enhancement on the Rear and ribbed walls is attributed to the rib-induced secondary flow, which carries the fresh cold air from the passage core region towards the Rear wall and enhances the Nu appreciably. It was also confirmed that while the existence of the gaps between the Front wall and ribs provides more even Nu distribution on the ribbed walls due to the strengthening of the flow structure, in the case of the gaps between tire Rear wall and ribs, it causes a significant mean Nusselt number deterioration on the both ribbed and both smooth walls.


Articles with similar content:

Effects of Rib Height on Heat Transfer Performance Inside a High Aspect Ratio Channel with Inclined Ribs
Journal of Enhanced Heat Transfer, Vol.10, 2003, issue 4
Akira Murata, Robert Kiml, Sadanari Mochizuki

Local heat/mass transfer characteristics in a square duct with various rib arrangements
International Heat Transfer Conference 12, Vol.47, 2002, issue
Y. Y. Kim, Chung Choi, Dong Ho Rhee, Sei Young Lee, Hyung-Hee Cho, S. J. Wu

Distributions of Local Heat Transfer Coefficient on Surfaces with Solid and Perforated Ribs
Journal of Enhanced Heat Transfer, Vol.5, 1998, issue 1
S. C. Lau, R. T. Kukreja

NUMERICAL STUDY ON FLOW AND HEAT TRANSFER IN A RECTANGULAR CHANNEL WITH 45 DEG RIB TURBULATORS AND BLEED HOLES
Journal of Enhanced Heat Transfer, Vol.19, 2012, issue 5
Ya Jun Song, Zhong Yang Shen, Yong Hui Xie, Di Zhang

The Effects of Gap Position in Discrete Ribs on Local Heat/Mass Transfer in a Square Duct
Journal of Enhanced Heat Transfer, Vol.10, 2003, issue 3
Y. Y. Kim, C. K. Choi, Sei Young Lee, Hyung-Hee Cho, Dong-Ho Rhee, S. J. Wu