Showing papers by "E. R. G. Eckert published in 1972"
TL;DR: In this paper, the performance advantage of roughened tubes in heat exchanger design, relative to smooth tubes of equal diameter, is defined and the graphical results of example solutions are presented for the repeated-rib roughness.
404 citations
TL;DR: In this article, a turbulent boundary layer on a porous plate is described, and the transfer of heat mass at the surface of the boundary layer is investigated. But the authors do not consider the transfer in the turbulent boundary layers.
65 citations
TL;DR: In this article, the authors measured the time-dependent mass transfer rates in the transition and turbulent regimes, and the measured local laminar mass transfer coefficients agreed with analytical predictions, both for vertical and inclined surfaces.
52 citations
19 citations
TL;DR: In this article, the influence of free-stream turbulence on the local heat transfer from a sphere situated in a forced-convection airflow was investigated using a miniature heat-flux sensor which could be positioned at any circumferential location on the equator of the sphere.
Abstract: Experiments involving both heat-transfer and turbulence-field measurements were performed to determine the influence of free-stream turbulence on the local heat transfer from a sphere situated in a forced-convection airflow. The research was facilitated by a miniature heat-flux sensor which could be positioned at any circumferential location on the equator of the sphere. Turbulence grids were employed to generate free-stream turbulence with intensities of up to 9.4 percent. The Reynolds-number range of the experiments was from 20,000 to 62,000. The results indicate that the local heat flux in the forward region of the sphere is uninfluenced by free-stream turbulence levels of up to about 5 percent. For higher turbulence levels, the heat-flux increases with the turbulence intensity, the greatest heat-flux augmentation found here being about 15 percent. Furthermore, at the higher turbulence intensities, there appears to be a departure from the half-power Reynolds-number dependence of the stagnation-point Nusselt number. Turbulent separation occurred at Reynolds numbers of 42,000 and 62,000 for a turbulence level of 9.4 percent, these values being well below the transition Reynolds number of 2 × 105 for a sphere situated in a low-turbulence flow.
14 citations
TL;DR: In this article, the cross-sectional distributions of axial turbulence intensity and time-mean velocity in hydrodynamically developed pipe flows were made by means of a hot-film anemometer.
14 citations
7 citations
TL;DR: In this article, a general noncircular duct convective heat boundary conditions for a channel-gas flow with Neumann-type thermal is presented, and a general study of a heat transmission probJ. Heat Transfer a,467472 (1961).
3 citations