Computer cooling using a two phase minichannel thermosyphon loop heated from horizontal and vertical sides and cooled from vertical side

Abstract

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.

Validation of the generalized model of two-phase thermosyphon loop based on experimental measurements of volumetric flow rate

“…The generalized model of the two-phase thermosyphon loop and its different variants were demonstrated in previous papers [2,[6][7][8][9][10][11][12]. This paper presents the theoretical analysis and the experimental data obtained for a new designed variant particularly suited for computer cooling requirements.…”

“…For example, the heat sources can be sitted at the bottom horizontal pipe or on the right/left vertical channels; similarly, the heat sinks can be chosen at the top horizontal pipe or on the right/left verti-cal channels. It is shown that this generalized model can be used to describe any possible individual variants of thermosyphon loop including the earlier variants developed by the author [2,[8][9][10][11][12]. Fluid flow in a thermosyphon loop is created by the buoyancy force that evolves from the density gradients induced by temperature differences in the heating and cooling sections of the loop.…”

“…The two-phase thermosyphon loop has been extensively investigated for its possible applications in the cooling systems of electronic devices by many researchers [1][2][3][4][5]. In fact, there is still a need for further studies to understand the thermosyphon cooling process.…”

Application of a two-phase thermosyphon loop with minichannels and a minipump in computer cooling

“…The one-dimensional, steady-state governing equations for thermosyphon loop with minichannels and minipump can be written as [3][4][5][6][7][8][9][10]18]:…”

“…The total length of the loop is denoted by L, the cross-section area of the channel by A and the wetted perimeter by U . Both superheating and subcooling are neglected and a linearly varying quality function x(s) are assumed according to [3][4][5][6][7][8][9][10].…”