Alternative models for transient convection heat transfer in external flows over a plate exposed to a variable heat flux

Comparison of time-resolved heat transfer characteristics between laminar and turbulent convection with unsteady flow temperatures

“…This decrease phenomenon in heat transfer coefficient obtained by experimental measurement is compatible with the temporal behavior of heat transfer coefficient in a transient heat transfer process obtained by Lachi et al [13] with analytical/numerical method. In the period when the flow temperature is constant with time, the heat transfer coefficients at P1 and P2 are nearly constant with time, and the decrease of temperature difference between T g ðtÞ and T s ðtÞ has no influence on the heat transfer coefficients.…”

“…Investigations on the temporal behavior of laminar heat transfer under unsteady thermal conditions have been carried out experimentally [12] and theoretically [13,14]. The transient measurement results by Butler and Baughn [12] showed that the laminar heat transfer coefficient on a flat plate could vary significantly for different upstream surface temperature conditions.…”

“…The transient measurement results by Butler and Baughn [12] showed that the laminar heat transfer coefficient on a flat plate could vary significantly for different upstream surface temperature conditions. Lachi et al [13] presented an analytical/numerical approximate solution for the laminar forced convection problem with a time variation in the heat flux density over a flat plate. The unsteady behavior of the convective heat transfer coefficient was clearly put into evidence in a short initial period of a changed thermal boundary condition.…”

Experimental correlation of forced convection heat transfer from a NACA airfoil

“…Predicted temperature and velocity profiles showed good agreement with experimental data. Lachi et al [8] analyzed transient heat transfer based on an integral method with fourth-order Karman-Pohlhausen polynomials and a similarity solution for velocity and temperature profiles within the boundary layer. The approximate solution was presented for a laminar forced convection problem with a time-dependent heat flux over a flat plate.…”

Heat convection length for boundary-layer flows

“…Solutions from transient analyses for external flows subjected to step and periodic boundary conditions disturbances, with or without impulsively and periodically heated walls are available [18][19][20][21].…”