Numerical Simulation and Experimental Validation of the Four Channel Hot Air Gun Heating System

Abstract

In the spectral emissivity measurement of material, one domain uncertainty source is the measurement of the actual sample surface temperature. This paper presents a novel method on heating the sample—the four channel hot air heating method, with the purpose of making sure that the heat flux is nearly equal to zero inside the sample, which is essential for the low thermal conductive materials. So the temperature difference between the sample surface and inside can be neglected. The FEA (Finite Element Analysis) method, through using FLUENT, was adopted to numerically simulate the temperature profile of the new heating system. The simulation results showed that temperature profile at the direction of X in ±15 mm ranges at the central area of exits of the air-guide duct is almost at ±5°C and at the direction of Y in ±15 mm ranges is nearly ±10°C. The temperature profile was experimentally studied by using thermocouples, the numerical simulation and experimental results were in good coherence.