In addition to the conjugate simula

In addition to the conjugate simulations, a second domain was developed for each geometry comprised of only the fluid domain. These simulations utilised the same boundary conditions as above but for the coolant inlet temperature which was specified as the film temperature (Tc,e) obtained from the conjugate simulations. This permitted the measurement of the adiabatic film wall temperature, Taw , directly from this second set of simulations. Therefore, through both the conjugate and fluid only simulations, both the solid temperature, adiabatic wall temperature, and surface heat transfer coefficients could be obtained at each of the coolant mass flow rates. Note, the mainstream Reynolds number quoted in Table 3 is based on the film hole diameter and provides a match to engine conditions. Thermal resistances were calculated as per the previous section where heat transfer coefficients were obtained from the results of the conjugate simulations. However, in contrast to the previous section, the external film wall heat transfer coefficient was also obtained directly from the simulations and consequently demonstrated some variation with coolant mass flow rate. The fluid only simulations permitted a direct measurement of the adiabatic wall temperature at each coolant mass flow rate. Consequently, a simplified form of the iterative loop shown in equations 23 – 28 could be implemented with fewer approximations necessary. With the heat flows calculated, the wall temperatures could be predicted using the thermal resistance model, consequently permitting the overall effectiveness to be obtained.