The thermal inspection method of claim 1, comprising using the heat transfer coefficients to determine the cross-sectional area for respective ones of the at least one opening by solving an equation h=(k/D)CRemPrn, where k is a thermal conductivity of the fluid, D is a hydraulic diameter of a connecting orifice, Re is the Reynolds number, Pr is the Prandtl number, and C, m and n are correlation co