Experimental investigation of local heat transfer for complex-shaped surfaces using thermochromic liquid crystals

2016 ◽  
Vol 59 (2) ◽  
pp. 218-223
Author(s):  
I. N. Baibuzenko ◽  
A. A. Sedlov ◽  
V. L. Ivanov
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Liquid Crystals ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Thermochromic Liquid Crystals

Experimental Investigation of Local Heat Transfer Distribution on Smooth and Roughened Surfaces Under an Array of Angled Impinging Jets

2004 ◽  
Vol 127 (3) ◽  
pp. 532-544 ◽  
Author(s):  
Lamyaa A. El-Gabry ◽  
Deborah A. Kaminski
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Local Heat Transfer ◽  
Target Surface ◽  
Reynolds Numbers ◽  
Local Heat ◽  
Impinging Jets ◽  
Temperature Data ◽  
Test Rig ◽  
Surface Temperature Data

Measurements of the local heat transfer distribution on smooth and roughened surfaces under an array of angled impinging jets are presented. The test rig is designed to simulate impingement with crossflow in one direction. Jet angle is varied between 30, 60, and 90deg as measured from the target surface, which is either smooth or randomly roughened. Liquid crystal video thermography is used to capture surface temperature data at five different jet Reynolds numbers ranging between 15,000 and 35,000. The effect of jet angle, Reynolds number, gap, and surface roughness on heat transfer and pressure loss is determined along with the various interactions among these parameters.

An Experimental Investigation of Natural Convection With Vertical Cylinders in Mercury

1974 ◽  
Vol 96 (4) ◽  
pp. 455-458 ◽  
Author(s):  
L. E. Wiles ◽  
J. R. Welty
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Natural Convection ◽  
Flat Plate ◽  
Convection Heat Transfer ◽  
Vertical Cylinder ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Transfer Coefficients ◽  
Flat Plates

An experimental investigation of laminar natural convection heat transfer from a uniformly heated vertical cylinder immersed in an effectively infinite pool of mercury is described. A correlation was developed for the local Nusselt number as a function of local modified Grashof number for each cylinder. A single equation incorporating the diameter-to-length ratio was formulated that satisfied the data for all three cylinders. An expression derived by extrapolation of the results to zero curvature (the flat plate condition) was found to agree favorably with others’ work, both analytical and experimental. The influence of curvature upon the heat transfer was found to be small but significant. It was established that the effective thermal resistance through the boundary layer is less for a cylinder of finite curvature than for a flat plate. Consequently, local heat transfer coefficients for cylinders are larger than those for flat plates operating under identical conditions.

An Experimental Investigation of Heat Transfer Around A Tube in A Bank

1976 ◽  
Vol 98 (3) ◽  
pp. 503-508 ◽  
Author(s):  
S. Aiba ◽  
Y. Yamazaki
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Static Pressure ◽  
Strong Dependence ◽  
Cross Flow ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Free Shear Layer ◽  
Pitch Ratio ◽  
The Difference

An experimental investigation of heat transfer and flow around the second cylinder of three cylinders in cross flow of air was conducted. The cylinders were situated in tandem at equal distances between centers. Their in-line pitch ratio was in the range 1.3 ≦ c/d ≦ 5.0 (c = center-to-center distance; d = diameter); the Reynolds number was 40000. Heat transfer results indicate a strong dependence on the difference between the maximum static pressure on the surface and the static pressure at the front stagnation point of the second cylinder. The maximum local heat transfer around the second cylinder occurs at the position where the free vortex layer (free shear layer) shed from the first cylinder attaches. However, the turbulence intensity near the wall at this same position is lower than that at other angular positions.

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