Showing papers in "Journal of Heat Transfer-transactions of The Asme in 1970"
219 citations
TL;DR: Experimental average heat transfer coefficients for free-convection cooling of arrays of isothermal fins on horizontal surfaces over a wider range of spacings than previously available are reported in this article.
Abstract: Experimental average heat-transfer coefficients for free-convection cooling of arrays of isothermal fins on horizontal surfaces over a wider range of spacings than previously available are reported. A simplified correlation is presented and a previously available correlation is questioned. An optimum arrangement for maximum heat transfer and a preliminary design method are suggested, including weight considerations.
177 citations
TL;DR: In this paper, numerical methods are used to solve the field equations for heat transfer in a porous medium filled with gas and bounded by plane rectangular surfaces at different temperatures, and the relative increases in heat transfer rate, corresponding to natural convection, are obtained as functions of 3-dimensional parameters: the Darcy number Da, the Rayleigh number Ra and a geometric aspect ratio L/D.
Abstract: Numerical methods are used to solve the field equations for heat transfer in a porous medium filled with gas and bounded by plane rectangular surfaces at different temperatures. The results are presented in terms of theoretical streamlines and isotherms. From these the relative increases in heat transfer rate, corresponding to natural convection, are obtained as functions of 3- dimensionless parameters: the Darcy number Da, the Rayleigh number Ra, and a geometric aspect ratio L/D. A possible correlation using the lumped parameter Da Ra is proposed for Da Ra greater than about 40. (33 refs.)
155 citations
TL;DR: Radiative heat flux between two parallel copper disks at cryogenic temperature, showing dependence on emitter temperature and spacing as discussed by the authors, showing that the radii flux depends on the number of parallel disks.
Abstract: Radiative heat flux between two parallel copper disks at cryogenic temperature, showing dependence on emitter temperature and spacing
133 citations
112 citations
TL;DR: In this paper, the authors applied the theory of moving heat sources to two models to determine the effect of convective surface cooling on temperature distributions, which can be used to predict temperature distributions occurring in certain machining processes or other processes involving heat sources.
Abstract: The theory of moving heat sources is applied to two models to determine the effect of convective surface cooling on temperature distributions. The models chosen consist of a translating semi-infinite body and a rotating cylindrical body, each having a band heat source acting on a portion of the surface and convective cooling acting over the entire surface. The analytical results can be utilized to predict temperature distributions occurring in certain machining processes or other processes involving heat sources.
108 citations
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TL;DR: Boundary layer and heat transfer measurements for turbulent boundary layer laminarizing in conical nozzle flow with wall cooling were performed in this article, showing that turbulent boundary layers can be laminated by wall cooling.
Abstract: Boundary layer and heat transfer measurements for turbulent boundary layer laminarizing in conical nozzle flow with wall cooling
TL;DR: In this paper, the effect of mechanical vibrations on convective heat transfer in an enclosure of rectangular cross-section was investigated experimentally and the results showed that vibration of a thermally active enclosure can have a significant effect on its heat transfer characteristics especially near the resonant natural frequency of the column of fluid contained within the enclosure.
Abstract: The effect of mechanical vibrations on natural convective heat transfer in an enclosure of rectangular cross-section was investigated experimentally. The enclosure was comprised of two vertical and opposed surfaces which were maintained at different temperatures, surrounded by four other adiabatic surfaces. Vibration stresses were applied to this heat transfer cell by mounting it vertically on the armature of an electrodynamic vibrator. Frequencies from 0 to 4000 Hertz and accelerations from 0 to 110 g’s were utilized in the investigation. The results show that vibration of a thermally active enclosure can have a significant effect on its heat transfer characteristics especially near the resonant natural frequency of the column of fluid contained within the enclosure. Increases in convective heat transfer coefficients of as much as 50 percent were obtained during this investigation. A correlation equation was developed by utilizing the dynamic response characteristics of the fluid column when considered as a seismic mass.
TL;DR: In this article, the transition from turbulent to laminar regime as consequence of high heating rates for internal convective flow was discussed, noting roles of Nusselt numbers and friction factors.
Abstract: Transition from turbulent to laminar regime as consequence of high heating rates for internal convective flow, noting roles of Nusselt numbers and friction factors
TL;DR: In this article, heat transfer to highly accelerated turbulent boundary layer with and without mass addition, presenting data in terms of Stanton number vs Reynolds number, and the data were presented in terms the Stanton number and Reynolds number.
Abstract: Heat transfer to highly accelerated turbulent boundary layer with and without mass addition, presenting data in terms of Stanton number vs Reynolds number