Author(s): Ning Yang; Szuyung Chen; Byungjin An; Junnosuke Okajima; Yuka Iga

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Abstract: Although a change in the cavitation regime has been observed on heated surfaces, the exact area of the wall that primarily drives this transition remains unclear. This study experimentally examined how surface temperature in different regions affects cavitating flow, specifically in terms of the cavitation regime. The experiments were conducted using a convergent–divergent Venturi nozzle composed of two sections that could be independently heated. Heating could be applied to the entire nozzle, or selectively to either the front section, where the cavity sheet originates; or the rear section, where it further develops. In comparison to the unheated case, which showed sheet-cloud cavitation, fully heating of the Venturi nozzle resulted in transient cavitation. A similar transition occurred when only the front section was heated. However, heating the rear section alone did not alter the cavitation regime. These findings suggest that the transition in cavitation regime on heated surfaces is primarily influenced by temperature rise at the cavity sheet’s leading edge. The influence of different water temperature on this transition phenomenon was also investigated.

DOI: https://doi.org/10.1088/1755-1315/1561/1/012004

Year: 2025