The current paper presents the experimental validation of the generalized model of the two-phase thermosyphon loop. The generalized model is based on mass, momentum, and energy balances in the evaporators, rising tube, condensers and the falling tube. The theoretical analysis and the experimental data have been obtained for a new designed variant. The variant refers to a thermosyphon loop with both minichannels and conventional tubes. The thermosyphon loop consists of an evaporator on the lower vertical section and a condenser on the upper vertical section. The one-dimensional homogeneous and separated two-phase flow models were used in calculations. The latest minichannel heat transfer correlations available in literature were applied. A numerical analysis of the volumetric flow rate in the steady-state has been done. The experiment was conducted on a specially designed test apparatus. Ultrapure water was used as a working fluid. The results show that the theoretical predictions are in good agreement with the measured volumetric flow rate at steady-state.
This paper focuses on the computer cooling capacity using the thermosyphon loop with minichannels and minipump. The one-dimensional separate model of two-phase flow and heat transfer in a closed thermosyphon loop with minichannels and minipump has been used in calculations. The latest correlations for minichannels available in literature have been applied. This model is based on mass, momentum, and energy balances in the evaporator, rising tube, condenser and the falling tube. A numerical analysis of the mass flux and heat transfer coefficient in the steady state has been presented.
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A one-dimensional model of two-phase flow and heat transfer has been presented for a closed thermosyphon loop with minichannels heated from the vertical side and cooled from the horizontal one. The model is based on mass, momentum, and energy balances in an evaporator, rising tube, condenser and a falling tube. A separated two-phase flow model is used in calculations. The effect of geometrical parameters of the loop on the mass flux rate in a steady state has been numerically examined. A numerical analysis of the heat transfer coefficient in a flow boiling and condensation has been done.
PL
Przedstawiono jednowymiarowy model wymiany ciepła i przepływu płynu dwufazowego w minikanałowym, zamkniętym obiegu termosyfonowym z ogrzewaniem pionowego odcinka obiegu i chłodzeniem na odcinku poziomym. W modelu sformułowano równania zachowania masy, ruchu i energii dla grzejnika, chłodnicy i kanałów łączących. Analizę oparto na modelu rozdzielonym przepływu czynnika dwufazowego. Określono numerycznie wpływ parametrów geometrycznych obiegu na wartość masowej prędkości zredukowanej w stanie ustalonym. Przedstawiono rozkład współczynnika przejmowania ciepła podczas wrzenia i kondensacji w przepływie czynnika dwufazowego.
In the present paper it is proposed to consider the computer cooling capacity using the thermosyphon loop. A closed thermosyphon loop consists of combined two heaters and a cooler connected to each other by tubes. The first heater may be a CPU processor located on the motherboard of the personal computer. The second heater may be a chip of a graphic card placed perpendicular to the motherboard of personal computer. The cooler can be placed above the heaters on the computer chassis. The thermosyphon cooling system on the use of computer can be modeled using the rectangular thermosyphon loop with minichannels heated at the bottom horizontal side and the bottom vertical side and cooled at the upper vertical side. The riser and a downcomer connect these parts. A one-dimensional model of two-phase flow and heat transfer in a closed thermosyphon loop is based on mass, momentum, and energy balances in the evaporators, rising tube, condenser and the falling tube. The separate two-phase flow model is used in calculations. A numerical investigation for the analysis of the mass flux rate and heat transfer coefficient in the steady state has been accomplished.
Przedstawiono model termosyfonu dwufazowego z ogrzewaniem bocznym. Zamknięte termosyfony umożliwiają transport ciepła za pomocą konwekcji naturalnej. Analizę ruchu płynu i wymiany ciepła oparto na stacjonarnym, jednowymiarowym modelu. Dwufazowy przepływu płynu opisano za pomocą modelu poślizgowego. Pokazano wpływ geometrii na wartość masowego natężenia przepływu płynu dwufazowego w stanie ustalonym.
EN
Two-phase thermosyphon with lateral heating is presented in this paper. Closed thermosyphon loops are devices capable of transporting heat through natural convection process. The analysis of fluid flow and heat transfer is based on the one-dimensional model at a steady-state. The slip two-phase flow model is used in calculations. It is shown that geometrical parameter of loop have influence on the mass flow rate at the steady-state.
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