Abstract
The heat transfer from surfaces may in general be enhanced by increasing the heat transfer coefficient between a surface and its surroundings, and by increasing the heat transfer area of the surface, or by both. In most cases the heat transfer is concerned with the application of artificial surface roughness techniques as a turbulence promoter for convective heat transfer enhancement. To measure the transient and local convective heat transfer coefficient of an artificial roughened duct using liquid crystal thermography (LCT) technique, an experimental setup have been designed and developed. The aspect ratio of duct was maintained as three with relative roughness height ratio (e/D) of 0.13 and angle of attack is 900 for the range of Reynolds number from 7000 to 17500.
Highlights
The application of heat exchanger is wide and the effective heat exchange or heat transfer is different in different applications
This variation of colour with respect to time has been used for the analysis of local convective heat transfer coefficient
For the quantitative analysis of the local convective heat transfer coefficient of artificially roughened duct has been measured for the selected operating and roughness parameters
Summary
The application of heat exchanger is wide and the effective heat exchange or heat transfer is different in different applications. There has been an increasing use of desktop computers in scientific and industrial applications, first to facilitate conventional experiments and to expand the range of possible experiments. These two new tools have come together during the past 10 years to produce a powerful new experimental technique, true-colour digital processing of liquid crystal images to yield full-field measurements of temperature, heat transfer coefficient distributions, as a judgment of food quality, and for electronic components and colour photographs, among other applications. The enhancement of heat transfer is greatly influenced by roughness geometry and in order to understand the actual mechanism of heat transfer temperature field measurement or velocity field measurement is required
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