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Heat Transfer Measurement Using a Transient Liquid Crystal Technique and Numerical Anlysis  

Hong Cheol-Hyun (부산대학교 기계설계전산화인력양성센터)
Lee Ki-Baik (부산대학교 기계공학과, 기계기술연구소)
Yang Jang-Sik (부산대학교 기계기술연구소)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.29, no.1, 2005 , pp. 68-77 More about this Journal
Abstract
A transient liquid crystal technique has become one of the most effective ways in measuring the local heat transfer coefficients on the entire surface. The key Point of this technique is to convert the inlet flow temperature into an exponential temperature profile using a mesh heater. In order to verify the validity of this technique. the heat transfer characteristics on the wall surface by a pair of longitudinal vortices is investigated experimently and numerically. A standard ${\kappa}-{\varepsilon}$ is used for the numerical analysis of turbulent flow field. It is found from experiment and numerical analysis that two peak values exist over the whole domain. as the longitudinal vortices move to the farther downstream. these peak values decrease and the dimensionless averaged Nusselt number with the lapse of time is maintained nearly at constant values. The experiment results obtained from the present experiment in terms of the transient liquid crystal technique are in good agreement with the numerical results. Therefore, the transient liquid crystal technique developed for the measurement of heat transfer coefficient is proved to be a valid method.
Keywords
Transient liquid crystal technique; Vortex generator; Mesh heater; Heat exchanger;
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