Study of two phase thermal stratification in cylindrical vessels: CFD simulations and PIV measurements
作者： Mayurkumar S. Gandhi , Jyeshtharaj B. Joshi , Pallippattu K. Vijayan
DOI: 10.1016/J.CES.2013.04.051
关键词: Natural convection 、 Heat exchanger 、 Heat transfer coefficient 、 Heat flux 、 Particle image velocimetry 、 Meteorology 、 Heat transfer 、 Thermosiphon 、 Baffle 、 Engineering 、 Mechanics 、 Industrial and Manufacturing Engineering 、 Applied mathematics 、 General chemistry 、 General Chemical Engineering
摘要: Buoyancy induced flow and heat transfer are important phenomena in a wide range of engineering systems including electronics photovoltaics cooling, thermosiphon hydrosiphon exchangers, solar-thermal absorbers, passive decay removal systems, etc. Such vulnerable to thermal stratification, which can significantly compromise performance. The objective the present work is study different characterized by an absence active components such as pumps. We have investigated two phase (boiling) natural convection, order find ways modify extent stratification. considered base case cylindrical tank, fitted with central heating tube constituting surface. In addition, large number design modifications been considered. field corresponding stratification compared case. following this system: (a) changing ratio length (of tube) liquid height (LT/H), (b) provision draft designs act chimney, (c) attachment circular horizontal baffles (both non-conducting conducting). investigations were made using Computational Fluid Dynamic (CFD) simulations implemented via commercial software FLUENT-6.3. CFD predictions experimental measurement obtained Particle Image Velocimetry (PIV) temperature measurements thermocouples. extents mixing for Rayleigh numbers (9.37×1010≤Ra≤5.57×1013). A good agreement has between measurements. results show that use conducting appropriate size, number, location reduce concomitantly enhance through fields flux.
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