Numerical investigation of the effects of inlet geometry on the isothermal and non-isothermal pipe flow

The pipe can be connected to the tank without protruding or flush, as the inlet connection type of the pipe acts on downstream in fluid passage from a reservoir (depot or tank). According to this study, the downstream effects of pipe connection to the reservoir without protruding (sharp edged, L / D = 0), 30mm protruding (L / D = 1) and 60mm (L / D = 2) were analyzed according to statistics. In this study, water flows of Reynolds numbers of 1000, 2000, 4000, 7000, 10000, 15000, 20000 and 100000 were simulated with D = 30mm diameter pipe. Pipe flow after tank exit was analyzed for isothermal and non-isothermal conditions. In the non-isothermal state, the constant wall heat flux was applied to a pipe flow of 2.7m such that 30kW / m2. According to the statistical results, it was analyzed that the velocity profiles were slightly different between the protruding and non-protruding pipe entries. The local loss coefficients of all three input flows decreased as exponent forces up to Re = 20000 and remained constant in later Reynolds numbers. Here in this case, the loss coefficient of the 60mm protruding entrance is the highest and the one without protrusion is the lowest. The effects of all three inlet types on the friction factor after the tank were found to be similar. In non-isothermal pipe flow, there was a difference between friction factors in protruding and protruding flows. While the local convection heat transfer coefficient in pipe flow changed as exponent force in developing flow, it was found to be constant at full developed flow. In the thermally developed flow region, it was found that the heat transfer coefficients of the projected inlet flows were slightly higher than the projected inlet flow. It was observed that the temperature change curve along the pipe flow was similar to the change curve in the experimental study.