Optics and Photonics Society of Iran

In this study, thermal conductivity of fluids (Water and Ethylene glycol) have been determined using moiré deflectometry method. The method is based on the displacement of moiré fringes due to a refractive index gradient, affected by temperature gradient. For this, were measured moiré fringes displacement under a temperature gradient on the fluid from up to down. As applied temperature gradient is from up to down, just heat conduction mode may be participate to heat transfer in the fluid. The thermal conductivity of fluid (water and ethylene glycol) was then evaluated by determination of the heat transfer in fluid, and so the moiré fringe displacements, using COMSOL software. The thermal conductivity values obtained using current method are very good agreement with those reported before.