To improve the V-groove cavity devised for directional control of radiation heat transfer, a new model with a black fin provided on the cavity base is proposed. The radiative characteristics of the new model are theoretically offered comparing two typical constitutional forms—symmetrical and asymmetrical. It is evident that the fin helps accelerate radiation heat transfer from the V-groove and promote its collimation. The effects can be further enhanced by carefully choosing the various geometrical parameters. The new V-groove cavity proposed would probably be evaluated as a favorable directional surface. The direction of energy collimation can be altered by using the asymmetrical groove cavity.

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