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Parametric Study of a Thermosyphon

Vice President of Engineering
RAC is a Mechanical Engineer, Heat Transfer Fluid Mechanics Consultant with world-class expertise in heat transfer, fluid mechanics, mass transfer analyses, basic structural analysis, specialization in computer systems and analysis/design of thermal systems, turbulence, natural convection, forced convection, radiation heat transfer, porous media, metal combustion, electrochemistry, chemical thermodynamics, induction heating, material phase change, and the thermal aspects of safety analyses.

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Problem: Determine what parameters effect the heat transfer and fluid flow in a "U-shaped" thermosyphon. This configuration represented a scheme that was being used for the storage of spent nuclear fuel. Traditional analysis methods relied heavily on Reynolds number correlations for passive heat removal, rather than on Raleigh number correlations. The geometry of problem is shown in figure 1.

Solution: Develop a two-dimensional model to analyze the performance of a "U-shaped" thermosyphon over a range of operating conditions. The flow along the heated surface was boundary layer in nature, and the heat transfer off of this surface at higher Ra could be approximated as heat transfer from a vertical flat plate. As shown in the plot in figure 2, the Nu for this system approaches the Nu for a vertical flat plate. The study allows passive heat removal systems to be designed through the use of simple engineering calculations, rather than complex 2-D or 3-D computations. Figure 2 shows the results of the numerical study.

Read other articles by this KKAI Associate:

Designing a Phase Change Material Heat Exchanger for Electronic Enclosures

Modeling of Induction Heating with A Computational Fluid Dynamics Package

Modeling of Injection Casting Process

The Design of A Freezing Point Measurement System

Mechanical Engineer, Heat Transfer Fluid Mechanics Consultant, heat transfer, fluid mechanics, mass transfer analyses, basic structural analysis, specialization in computer systems and analysis/design of thermal systems, turbulence, natural convection, forced convection, radiation heat transfer, porous media, metal combustion, electrochemistry, chemical thermodynamics, induction heating, material phase change, and the thermal aspects of safety analyses.
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Rapid Response Engineering® Solutions
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