[en] In the course of He II-He I phase transition studies, one phase of the investigations has been concerned with free convection in He I with the aim of simulating the heat transfer in rotating superconducting windings. A geometry similar to C-frame loops has been used in studies of free convection between the lambds-curve and the transposed critical curve at pressures between 0.3 and 1.5 MPa. Related model calculations have been carried out for cellular convection. A comparison of the data obtained shows reasonable agreement with the model results

[en] Effects of cavity aspect ratios and cavity inclination angles to natural convection in a rectangular cavity are numerically investigated. Investigation is performed at the Rayleigh number (Ra) equal to 10⁴, the cavity aspect ratios from 1 to 50 and the cavity inclination angles from 0 to 180°. Consequently, Heat transfer enhancement or decreasing due to the effects is exposed. In addition, streamline contours in the rectangular cavity are illustrated. Multi-cellular flow figuring on the appropriate conditions is exhibited. A new correlation of the average Nusselt number, the cavity aspect ratio and the cavity inclination angle is formulated at Ra equal to 10⁴. (paper)

[en] An attempt to account for microcharacteristics of boiling substance has been made in order to increase the accuracy and broaden the scope of heat transfer computations for boiling liquids with sharply contrasting properties. The following characteristics were used to systematize substances and to divide them into thermodynamically-identical groups: relative molecular mass of substance; similarity of intermolecular bond types; intermolecular interaction energy value. An energy table of the molecular system describing physical intermolecular properties of substances during transformations from liquid to vapor has been summarized basing on these characteristics

[en] Short communication

[en] Known mechanisms of heat transfer are ranked according to the efficiency of heat conversion at the maximum work load, according to Alikhanov’s thermodynamic principle of maximum power.

[en] Short communication

[en] The present problem deals with the magnetohydrodynamic boundary layer flow of a free convective heat transfer in a square cavity filled with nanofluid-saturated porous medium with the effects of different nanoparticles in the presence of thermal radiation. A uniform magnetic field is applied horizontal to the cavity. The top and bottom horizontal walls of cavity considered adiabatic, while the vertical walls are kept at constant temperatures. The governing partial differential equations are solved by finite element method of Galerkin weighted residual scheme. Numerical results are obtained for different values of the Rayleigh number, magnetic parameter, radiation parameter and nanofluid volume fraction. The overall investigation of variation of streamlines, isotherms and Nusselt numbers are presented graphically. To examine the accuracy, the present results are compared with the available results. (author)

[en] This book presents reprints of papers written by Wilhelm Nusselt and Ernst Schmidt, who were pioneers in the development of heat transfer theory and applications

[en] A Comment on the Letter by Brian R.Hunt and Edward Ott, Phys.Rev.Lett.76, 2254 (1996). The authors of the Letter offer a Reply. copyright 1998 The American Physical Society

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