# Understanding thermal models of cavitation

Cavitation is a phenomena that occurs in liquids when the local static pressure drops below the vapor pressure; bubbles form within the liquid.

I am studying cavitation in incompressible, two-phase (liquid & gas), homogeneous mixture of cryogenic fluids (liquid nitrogen in particular) within pipes and would like to understand the thermal effects involved. My main sources are: 1) "Implementation and validation of an extended Schnerr-Sauer cavitation model for non-isothermal flows in OpenFOAM" (https://www.sciencedirect.com/science/article/pii/S1876610217335397 section 2.3: Thermal model) and 2) "Method for prediction of pump cavitation performance for various liquids, liquid temperatures, and rotative speeds" (https://ntrs.nasa.gov/api/citations/19690019787/downloads/19690019787.pdf section: Determination of Cavity Pressure Depressions).

I would like to understand and discuss the thermal models they propose and see if they are applicable to my particular case.

When referring to heat transfer I mean convective heat transfer (which I assume to be a combination of conduction and advection).

1. They state "The convective heat transfer term is subtracted from the latent heat source term". Why? What I understand from this is that latent heat and heat transfer compete but I do not quite get why this should be the case. Let's look at the case of vaporization; the vaporization heat needed for vaporization of a liquid is the convective heat transfer needed to reach vaporization temperature and the latent heat of vaporization of the liquid, and not the difference...

2. They set a heat balance between the heat required for vaporization and the heat drawn from the liquid surrounding the cavity (that is, the liquid-vapor interface).

So I think that they are essentially stating the same idea: the net heat transfer for vaporization is the difference between net latent heat transfer and convective heat transfer.

• The intended meaning seems to me to be "The convective heat transfer term is decoupled [not literally subtracted] from the latent heat source term." After all, the two terms are added in the equation in very next sentence, and the preceding sentence mentions strong coupling. Apr 12 at 17:37