Abstract
The influences that the temperature pulsation contained in steady flow exerts on the heat transfer by convection from a hot wire are investigated by means of numerical experiment. The calculation is carried out in such a way that the energy equation is solved under the boundary conditions on temperature varying with time by using finite difference method, neglecting the variation of physical properties due to fluid temperature. The solution gives the temperature field around a hot wire, from which the mean Nusselt number taken over the hot wire surface is obtained. The results show that the mean Nusselt number fluctuates around a steady value with some phase delay from the temperature pulsation. In cases of extending the hot-wire anemometry to the flow accompanied by temperature fluctuation, therefore, it is necessary to take account of the above-mentioned unsteadiness appearing in the heat transfer by convection.
