Radiation Losses in a Decaying Laser Spark

An investigation has been done to numerically simulate the radiation losses which occur due to laser energy deposition. Although the fluid dynamic effects due to laser energy deposition have been studied by a number of researchers independently but the effect of radiation has either been neglected or has not been highlighted effectively. An Open Source CFD software OpenFOAM has been used to study the above effects.For radiation modeling, detailed line by line (LBL) spectral model has been developed. Accurate simulation of radiation heat transfer is carried out by line-by-line radiation modeling which requires very accurate absorption coefficient data at hundreds of thousands of wavelengths.It has been integrated with OpenFOAM to solve RTE using P1 solver. Radiation losses obtained are almost 500 times higher as compared to the past reported data but still, these losses are very less as compared to the deposited energy. Since the most accurate method, LBL also showed that radiation losses are negligible so this work validates the assumption of neglecting the radiation losses which was assumed in all previous studies without any proper validation.