Abstract
The heat transfer results for the numerical investigation of a planar open loop thermosyphon with conducting walls are presented. Laminar natural convection is due to heating the left ascending channel of a modified ‘U’ type thermosyphon with an upper and lower inlet in the right descending channel. Governing parameters investigated include the Rayleigh number ( Ra), the ascending channel aspect ratio ( Ar) and the lower inlet width ( W 2). Another parameter which combines the heated wall geometry and thermal conductivity is demonstrated to correlate the heat transfer results well. The average non-dimensional heat flux (Φ) is strongly affected by the wall thermal conductivity, primarily due to conduction resistance of the heated wall. For restrictive W 2 and low Ra, Φ decreases. At large Ra, however, Φ depends little on W 2. This is due to compensating inflow at the outlet (recirculation).
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