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ABSTRACT
In this paper, the effect of making swirling flow inside an annulus on the subcooled boiling heat transfer has been studied and discussed both experimentally and numerically. The Eulerian-Eulerian model and control volume technique have been used for numerical modeling of the problem. The experimental results show that the critical heat flux values are enhanced by making swirling flow. The experimental and numerical results also indicate that by making swirling flow inside the annulus, the subcooled boiling heat transfer coefficients are increased. Moreover, the experimental and numerical values of the boiling heat transfer coefficients show good agreement with each other.
Nomenclature
| = | interphase contact area (1/m) | |
| = | wall fraction influenced by nucleating bubbles | |
| = | specific heat capacity | |
| = | bubble mean diameter (m) | |
| = | bubble departure diameter (m) | |
| f | = | frequency (1/s) |
| = | drag force (N) | |
| = | lift force (N) | |
| = | wall lubrication force (N) | |
| = | turbulent dispersion force (N) | |
| = | virtual mass force (N) | |
| = | difference between specific enthalpies (J/Kg) | |
| = | liquid single-phase heat transfer coefficient (W/m2K) | |
| = | liquid thermal conductivity (W/m.K) | |
| = | active nucleation site density (1/m2) | |
| = | total heat flux (W/m2) | |
| = | quenching heat flux (W/m2) | |
| = | single-phase convection heat flux (W/m2) | |
| = | evaporation heat flux (W/m2) | |
| = | inner radius (m) | |
| = | outer radius (m) | |
| T | = | temperature (K) |
| u | = | velocity (m/s) |
Greek symbols
| = | void fraction | |
| = | density (Kg/m3) | |
| = | liquid dynamic viscosity |
Subscripts
| b | = | Bubble |
| l | = | Liquid |
| v | = | vapor |