Heat transfer and critical heat fluxes in short microchannels during boiling of zeotropic mixtures

A. S. Shamirzaev

S.S. Kutateladze Institute of Thermophysics, Siberian Division of the Russian Academy of Sciences, Novosibirsk, Russia

Abstract: A study of heat transfer during saturated boiling of zeotropic mixtures of propane–isobutane (R290–R600a) and difluoromethane–tetrafluoroethane (R32–R134a) was carried out in a system of two microchannels 16 mm long (section 2 $\times$ 0.2 mm) at mass fluxes up to 1350 kg/(m$^2$ $\cdot$ s). It has been established that under conditions of high mass fluxes, the latent heat of vaporization of the mixture does not have a noticeable effect on the value of the critical heat flux, and the critical heat flux is determined by friction in the channel.

Keywords: boiling, binary zeotropic mixtures, critical heat flux, microchannels.

Received: 03.11.2023
Revised: 23.11.2023
Accepted: 23.11.2023

DOI: 10.61011/PJTF.2024.05.57177.19794

Bibliographic databases:

•