By B. Sunden, C. A. Brebbia
This ebook comprises papers initially awarded on the 10th foreign convention on complicated Computational equipment and Experimental Measurements in warmth move, prepared into the subsequent subject components: usual and compelled convection; Advances in computational tools; warmth and mass move; Modelling and experiments; warmth exchanges and kit; Radiation warmth move; power structures; Micro and nano scale warmth and mass move; Thermal fabric characterization; Renewable and sustainable power; power stability and conservation.
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Results showed that the flow was laminar when the divergence angle was small (θ=2°) and that the larger the divergence angle the larger the penetration depth of ambient air in the channel from its upper end section, which forms an air downflow in the central region of the channel and an air upflow parallel to the boundary layer. A numerical simulation for vertical diverging and converging channels, with laminar steady state natural convection, was performed in . The heated length of the walls was lower or equal to the wall length and it was isothermal.
Temperature profiles as a function of time show overshoot and undershoot. A comparison between numerical flow patterns and experimental flow visualizations are also given and a good agreement is observed. Keywords: natural convection, divergent channel, transient analysis. 1 Introduction Natural convection in channels and parallel plates received very much attention for its application in engineering as reviewed in [1, 2]. These configurations have been employed in chemical vapor deposition reactors, solar collectors, nuclear reactors, heat exchangers and thermal control of electronic systems [3,4].
A velocity inlet boundary condition (uniform velocity distribution with a direction vector normal to the inlet boundary) was applied at the fluid inlet flow manifold. At the outlet, the boundary condition was assigned as outlet which means that gradients of all flow properties except pressure are set to zero. If the direction normal to the outlet boundary is denoted by y, the outlet boundary condition is expressed as in . represents all the scalar variables of interest (temperatures, physical properties etc).