By making use of local equilibrium assumption, a calculation has been made on , temperature distribution, Nusselt number and thermal eddy diffusivity for liquid metal turbulent heat transfer in a circular tube and the calculated results are discussed in comparison with available experimental data.
The entertainment by a particle laden concentric jet is theoretically determined and compared with direct measurements. Particles enhance the mixing.
An analysis of a steady two-dimensional flow of water at 4°C through a saturated porous medium bounded by a vertical, infinite and permeable plate is presented on the basis of generalized Darcy's law. Expression for the velocity and temperature fields as well as for the rate of heat transfer on the plate are obtained. Effects of Grashof number and permeability parameter on the flow characteristics are graphically presented and discussed.
Experiments were performed to determine the heat transfer characteristics of a turbulent pipe flow downstream of a flow control orifice. The orifice consisted of an orifice plate followed by an abrupt expansion. A total of fifty-four geometric variants were tested. The working fluid was water, with Prandtl number 7, and the Reynolds number range was from 50, 000 to 125, 000. The maximum Nusselt numbers observed were 3 to 5 times the value for the corresponding fully-developed flows.
Due to the complicated geometry, the heat conduction across a bent plate has never been treated analytically before. In this paper we utilize an intrinsic coordinate system in order to obtain the temperature profile by perturbations. The curvature of the plate tends to decrease the local temperature in the vicinity of the bend.
The problem of free convection along a vertical plane source or sink with uniform lateral mass flux in a porous medium is solved by the local non-similarity approximation. Solutions are carried out to the third level of truncation. Results for heat transfer characteristics as obtained from the third level of truncation are found in excellent agreement with a previous investigation using the finite difference method for a wide range of the mass flux parameter.
An investigation of the influence of freestream turbulence on the temperature and velocity boundary layers on a circular cylinder in cross flow is presented. The investigation has been carried out for the two Reynolds numbers 5·104 and 1·105 with freestream turbulence intensities ranging from 2.5 – 11.5 % and integral scales Λf∞/D ≲ 0.14. Both experiments and numerical calculations show that for the flow ranges considered, the mean velocity field is rather unaffected by the freestream turbulence while the mean temperature field is influenced in such a way that increases in heat transfer of order 8 – 1 10 % occur.
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