Analysis of transient conjugate heat transfer to a free impinging jet

Transient conjugate heat transfer during the impingement of a freejet of high Prandtl number fluid on a solid disk of finite thickness is considered. When power is turned on at t = 0, a uniform heat Bur is imposed on the disk surface. The numerical model considers both solid and fluid regions. Equations for the conservation of mass, momentum, and energy are solved in the liquid region, with the transport processes at the inlet and exit boundaries, as well as at the solid-liquid and liquid-gas interfaces taken into account. In the solid region, only heat conduction equation is solved. The shape and location of the free surface (liquid-gas interface) is determined iteratively as a part of the solution process by satisfying the kinematic condition as well as the balance of normal and shear forces at this interface. Computed results include the velocity, temperature, and pressure distributions in the fluid and the local and average heat transfer coefficients at the solid-fluid interface. Computations are carried out to investigate the influence of different operating parameters such as jet velocity, disk thickness, and disk material.