... cpg, the specific heat of the gas; mw,themass of the wall of the bulb; cpw, the specific heat of the wall; hf, the heat transfer coefficientbetween the filament and the gas; hg, the heat ... phenomena, in whichenergy transfer in the form of heat exists. Fundamentals of the Finite Element Method for Heat and Fluid Flow R. W. Lewis, P. Nithiarasu and K. N. Seetharamu 2004 John Wiley ... surfacearea of the metallic part in contact with the gas; hg, the heat transfer coefficient of the gas to the wall; Ag, the surface area of the gas in contact with the wall; hw, the heat transfer...