Measurement Technique for Determining the Surface Temperature Distribution along a Heated Liquid Film Using Thermography

Abstract

This paper describes an application of thermography to determine surface temperature of liquid which is moving along a heated wall surface. Breakdown of a thin liquid film is known to cause a problem in the heat transfer surface leading to a serious burnout phenomenon. To develop a technique to prevent the burnout phenomena, the mechanism of the burnout needs to be understand. Thus, we measured transient surface temperature of a thin liquid film using a thermography. Emissivity and absorption coefficients of water, a silicon oil and 1-propanol were determined by comparing its thermocouple measurement. As a result:(1) emissivity of water, a silicon oil and 1-propanol was approximately 0.95 and (2) transient temperature profiles on a liquid surface of wavy flow were obtained.