Experiments and Numerical Simulation for a Thermal Vertical Jet into a Rectangular Water Tank

Publication date: Available online 19 July 2018Source: Results in PhysicsAuthor(s): Mohamed F. El-Amin, Abdulmajeed Al-GhamdiAbstractIn this paper, experimental measurements and numerical CFD calculations are carried out for the problem of a vertical thermal water jet into a rectangular water tank. We consider two cases; the first case is to inject a hot-water jet with a uniform inlet temperature (UIT) into a cold-water tank. The second case is to inject a cold-water jet with non-uniform inlet temperature (NUIT) into a hot-water tank. In the UIT case, we examine the effects of the temperature-difference. In the case of NUIT, we studied the effects initial temperatures with constant flow rate; and different flow rates at constant initial temperature. Both turbulence intensity and Reynolds number are formulated to be a function of the inlet temperature for the NUIT case. The numerical simulations are carried out under the same conditions of the experiments. We use the realizable modeltodescribetheturbulentflowwiththeenergyequation.model to describe the turbulent flow with the energy equation. The symmetrical 3D half of the tank has been considered to reduce the computational cost. The water density is treated as a piecewise-linear of temperature. The turbulence at the inlet is characterized by the hydraulic diameter and the turbulence intensity. Several quantities are obtained and analyzed such as pressure, velocity, temperature, and turbulence. A good agreement between simulat...

Source: Results in Physics - July 19, 2018 Category: Physics Source Type: research