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• W281569494 abstract "We shall understand the heat-transfer crisis of an evaporative thermosiphon to be a disturbance in the heat-transferrin g capability of the ET which is a result of crisis phenomena in the operation of the heated section under conditions of combined progress of the processes (hydrodynamic and thermal) in the whole ET cavity. In contrast to heat pipes with capillary structure, in which the hydrodynamic blockage conditions can be substantial, conditions resulting in local and total scalding of the heating surface are the main reason for a crisis in the ET. Depending on the boundary conditions on the heating section, the crisis is manifested differently. For el = const, an asymptotic rise in the wall temperature is observed on the heating section with a simultaneous diminution in the value of the transferable power (Fig. 1). Analogous results are obtained in [5]. The forms for the appearance of a crisis can be distinct and depend primarily on the degree of fullness by the intermediate heat carrier ~, which governs the ratio between the volume of the liquid phase of the heat carrier under normal conditions and the physical volume of the thermosiphon. For ~2 - - 30% the fluid phase with low compressibility coefficients predominates in the thermosiphon cavity, and in a number of cases this specifies an explosion of the apparatus as el ~ qmax, which is associated with an abrupt rise in pressure [5]. Under heating conditions close to t = const, disturbance of the main functions of the apparatus (the transfer of heat flux) is characteristic rather than a temperature rise as q ~ qmax In this case it is expedient to record the onset of the crisis by the outgoing power rather than by the wall heating temperature. It is difficult to determine the temperature jump since it occurs at the site of dry spot formation, whose appearance is equally probable at different surface sites and is sporadic in nature [11]. For ~2 - 1.5% the theoretical analysis of the crisis is performed in the form of aa inverted NusseIt problem [10]. Up to now the physical reason for the crisis has not been clarified for 3% -< ~ -< 60%. Papers [5-7, 10], whose results cannot be compared, are devoted to the question under consideration. Thus, crisis phenomena in the rmos iphons with endface heat supply and outgo we re studied for the degrees of fullness 10% -< 17 -< 80%" @default.
• W281569494 created "2016-06-24" @default.
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• W281569494 date "1980-01-01" @default.
• W281569494 modified "2023-09-27" @default.
• W281569494 title "An experimental investigation is performed for the heat-transfer crisis in open and closed low- temperature thermosiphons." @default.
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