Showing papers in "Journal of Heat Transfer-transactions of The Asme in 1968"
TL;DR: Friction, momentum and gravity interactions effect on heat transfer process during annular flow condensation during heat transfer was studied in this paper, where friction, momentum, and gravity interaction effects were considered.
Abstract: Friction, momentum and gravity interactions effect on heat transfer process during annular flow condensation
211 citations
157 citations
117 citations
TL;DR: In this paper, a method for the prediction of the point where a significant amount of net vapor is first formed is derived and compared with experimental measurements at both low and high fluid velocities.
Abstract: The satisfactory prediction of the vapor volume fraction in subcooled boiling depends in large part on the ability to predict the point where a significant amount of net vapor is first formed. A method for the prediction of this point is derived here and compared with experimental measurements at both low and high fluid velocities. The derived relationships for this point include the effect of fluid properties, geometry, and the liquid velocity. A comparison with the empirical formula of Bowring [2] for water is given.
117 citations
100 citations
90 citations
TL;DR: Rohsenow nucleate pool-boiling data correlation, stressing coefficients dependence on surface preparation and liquid-surface combination as discussed by the authors, has been shown to be robust to surface preparation.
Abstract: Rohsenow nucleate pool-boiling data correlation, stressing coefficients dependence on surface preparation and liquid-surface combination
89 citations
72 citations
69 citations
67 citations
TL;DR: Pool boiling data at atmospheric pressure for mechanically polished and chemically etched 304 stainless steel surfaces in contact with distilled water was collected by as discussed by the authors, showing that the water boiling data for the steel surfaces contained in the steel surface can be obtained from a pool of distilled water.
Abstract: Pool boiling data at atmospheric pressure for mechanically polished and chemically etched 304 stainless steel surfaces in contact with distilled water
TL;DR: In this article, the effectiveness of a two-dimensional wall jet was evaluated using a constant value of lip thickness, 0.032 in, and four slot heights, viz., 0.5,0.25,0.,0.132, and 0.074 in.
Abstract: This paper presents measurements of the impervious-wall effectiveness of a two-dimensional wall jet obtained using a constant value of lip thickness, 0.032 in. and four slot heights, viz., 0.5, 0.25, 0.132, and 0.074 in. The measurements are in the range of slot-to-free-stream velocity ratio 0.288 ≤ uC/uG ≤ 2.66 and clearly demonstrate that, in the region where the velocity ratio is close to unity, the effectiveness is greatly dependent upon the slot height. The reason for this dependence is investigated and additional measurements are presented to show that the influence of the slot turbulence intensity on the effectiveness is small. It is concluded that the ratio of slot lip thickness to slot height is the most significant parameter and that the effect of an increase in this ratio is to decrease the effectiveness.
TL;DR: In this paper, the realistic boundary condition of the surface temperature varying with time is used in the heat transfer analysis of the solidification of a binary eutectic alloy system.
Abstract: The realistic boundary condition of the surface temperature varying with time is used in the heat transfer analysis of the solidification of a binary eutectic alloy system. The system occupies a semi-infinite region and consists of a solid zone, a freezing zone, and a liquid zone. The heat released in the freezing zone is treated as a discontinuous heat generation. The solid-fraction distribution in the freezing zone, given as a function of temperature, is solved simultaneously with the temperature distribution, which is given as a function of distance within the freezing zone. Using the “heat balance integral” technique, the method for the solution of the temperature distribution and the thickness of each region is given. As an example, the results are shown in graphical form for an Al-5 percent Cu alloy.
TL;DR: Bubble growth and collapse in liquid nitrogen, noting similarity to vapor bubbles behavior in non-cryogens as discussed by the authors, has been shown to be similar to the behavior of liquid nitrogen bubbles.
Abstract: Bubble growth and collapse in liquid nitrogen, noting similarity to vapor bubbles behavior in noncryogens
TL;DR: In this paper, the heat and momentum transfer analogy is employed to analyze the heat transfer phenomena for turbulent flow in concentric annuli, where a modification of the velocity distribution due to Van Driest is assumed and equations in dimensionless form are developed to predict: (a) the position of maximum velocity in the annulus; (b) the friction factor-Reynolds number relationship, and (c) temperature distributions and heat transfer relations over a wide range of Reynolds number and Prandtl modulus.
Abstract: The heat and momentum transfer analogy is employed to analyze the heat transfer phenomena for turbulent flow in concentric annuli. A modification of the velocity distribution due to Van Driest is assumed and equations in dimensionless form are developed to predict: (a) the position of maximum velocity in the annulus; (b) the friction factor-Reynolds number relationship, and (c) temperature distributions and heat transfer relations over a wide range of Reynolds number and Prandtl modulus.