Heat Transfer Characteristics of Turbulent Impinging Jet in Impingement Angle and Curved Surface Configuration using Transient Liquid Crystal Method

Abstract

The transient method of measuring heat transfer coefficients that uses liquid crystals, since its beginnings in the early 1980s, has become one of the best ways of determining surface distributions of heat transfer coefficient. In this paper, experimental results are presented of local surface heat transfer coefficients in a turbulent jet, impinging onto a curved surface which has the convex and concave surfaces. The preheated wall transient method is applied with liquid crystals. Different Reynolds numbers, distances between impingement jet and collision surface, and inclined angles are considered. This paper reports the correlation at the stagnation point heat transfer coefficients of Reynolds number, distances, and impingement inclined angles with Nusselt numbers.