scholarly journals Heat transfer measurement in rectangular channel with detach ribs by liquid crystal thermography

2018 ◽  
Vol 36 (4) ◽  
pp. 1502-1509
Author(s):  
Sibendra Kumar Gharai ◽  
Apurba Layek
Keyword(s):  
Heat Transfer ◽  
Liquid Crystal ◽  
Rectangular Channel ◽  
Liquid Crystal Thermography ◽  
Transfer Measurement ◽  
Heat Transfer Measurement

Heat transfer measurement in a rectangular channel of solar air heater with Winglet type ribs using liquid crystal thermography

2021 ◽  
pp. 1-9
Author(s):  
Amit Kumar ◽  
Apurba Layek
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Liquid Crystal ◽  
Rectangular Channel ◽  
Angle Of Attack ◽  
Solar Air Heater ◽  
Air Heater ◽  
Liquid Crystal Thermography ◽  
Relative Roughness ◽  
Absorber Surface

Abstract This paper deals with the study of heat transfer in solar air heater consisting of Winglet shaped roughness on the absorber plate using liquid crystal thermography technique. The winglet type roughness element was placed on the absorber surface of a rectangular channel solar air heater having an aspect ratio of 4. The absorber surface was heated uniformly by a constant heat flux of 800 W/m2. The non-dimensional roughness parameter considered as relative roughness pitch i.e., P/e, and its values range between 5-12 with Reynolds number (Re) range between 6500 - 22000. The value of angle of attack i.e., alpha and relative roughness width i.e. (W/w) were kept constant, and the relative roughness pitch was varied to measure the heat transfer coefficient. The enhancement in heat transfer has been compared and it is observed that at P/e of 8 for the angle of attack (α) of 60 degrees resulting it's optimum value. The enhancement of heat transfer with the increase in Reynolds number is also noted.

Heat transfer measurement using thermochromatic liquid crystal

2007 ◽  
Vol 7 (4) ◽  
pp. 413-420 ◽  
Author(s):  
Jang Sik Yang ◽  
Cheol Hyun Hong ◽  
Gyung Min Choi
Keyword(s):  
Heat Transfer ◽  
Liquid Crystal ◽  
Transfer Measurement ◽  
Heat Transfer Measurement
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