DOI: 10.1615/ICHMT.2015.THMT-15
ISBN Print: 978-1-56700-427-4
ISBN CD: 978-1-56700-428-8
An influence of the nanoparticles Al2O3 and TiO2 admixtures on thermophysical properties and flow boiling heat transfer coefficient of the R600a/mineral oil solutions
Краткое описание
An experimental investigation of the influence of Al2O3 and TiO2 nanopartical admixtures on the thermophysical properties of R600a/mineral oil solutions are presented in this paper. The nanoparticle admixtures in working fluids of vapor compression refrigeration machine have a significant influence on the thermophysical properties of fluids. Intensity variation of flow boiling heat transfer in evaporator of refrigerator is result of changes in the thermal properties of refrigerant/oil solutions with nanoparticles in compare with properties of working fluid without nanoparticles. The investigation of local heat transfer coefficients at flow boiling of R600a/oil/nanoparticles solutions have been performed in following ranges: temperature- 256 K, heat flux - from 2804.4 to 5267.7 W m−2, mass velocity of the working fluid - from 10.5 to 18.3 kg m−2 s−1. The nanoparticle admixtures in the refrigerant/oil solutions have a significant effect on the local heat transfer coefficient depending from vapor quality and heat flux in the evaporator.