Measurements of nucleation site density, n/A, have been obtained for forced convection boiling of refrigerant R113 in a horizontal 25 × 25 mm i.d. square transparent test section with a nichrome heating strip. It has been found that the behavior of the nucleation site density is significantly different from that found in pool boiling. The mean vapor velocity, heat flux, and system pressure appear to exert a strong parametric influence. It is demonstrated that although the nucleation site density is dependent on the critical cavity radius, rc, it is not sufficient for correlating n/A.

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