contributor author | Akhilesh P. Rallabandi | |
contributor author | Huitao Yang | |
contributor author | Je-Chin Han | |
date accessioned | 2017-05-09T00:33:45Z | |
date available | 2017-05-09T00:33:45Z | |
date copyright | July, 2009 | |
date issued | 2009 | |
identifier issn | 0022-1481 | |
identifier other | JHTRAO-27865#071703_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/141026 | |
description abstract | Systematic experiments are conducted to measure heat transfer enhancement and pressure loss characteristics on a square channel (simulating a gas turbine blade cooling passage) with two opposite surfaces roughened by 45 deg parallel ribs. Copper plates fitted with a silicone heater and instrumented with thermocouples are used to measure regionally averaged local heat transfer coefficients. Reynolds numbers studied in the channel range from 30,000 to 400,000. The rib height (e) to hydraulic diameter (D) ratio ranges from 0.1 to 0.18. The rib spacing (p) to height ratio (p/e) ranges from 5 to 10. Results show higher heat transfer coefficients at smaller values of p/e and larger values of e/D, though at the cost of higher friction losses. Results also indicate that the thermal performance of the ribbed channel falls with increasing Reynolds numbers. Correlations predicting Nusselt number (Nu) and friction factor (f¯) as a function of p/e, e/D, and Re are developed. Also developed are correlations for R and G (friction and heat transfer roughness functions, respectively) as a function of the roughness Reynolds number (e+), p/e, and e/D. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Heat Transfer and Pressure Drop Correlations for Square Channels With 45 Deg Ribs at High Reynolds Numbers | |
type | Journal Paper | |
journal volume | 131 | |
journal issue | 7 | |
journal title | Journal of Heat Transfer | |
identifier doi | 10.1115/1.3090818 | |
journal fristpage | 71703 | |
identifier eissn | 1528-8943 | |
keywords | Friction | |
keywords | Heat transfer | |
keywords | Channels (Hydraulic engineering) | |
keywords | Reynolds number | |
keywords | Heat transfer coefficients | |
keywords | Pressure drop | |
keywords | Flow (Dynamics) AND Copper | |
tree | Journal of Heat Transfer:;2009:;volume( 131 ):;issue: 007 | |
contenttype | Fulltext | |