Browsing by Subject "Heat convection"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    ItemOpen Access
    Effect on scaling of heat removal requirements in three-dimensional systems
    (1992) Ozaktas, H., M.; Oksuzoglu H.; Pease, R.F.W.; Goodman J.W.
    A first-order discussion of convective heat removal from a hypothetical 3-dimensional computing system is presented. A textbook treatment indicates that our heat removal capability can be characterized by a quantity Q, the amount of power we can remove per unit cross-section. Thus the minimum length of the system is proportional to the square root of the total power dissipated. We predict Q ∼ 104Wcm−2 assuming an applied pressure difference of 1 atm, a maximum temperature rise of 100K and the use of water as the coolant fluid. © 1992 Taylor & Francis Ltd.
  • Thumbnail Image
    ItemOpen Access
    Modeling of evaporation from a sessile constant shape droplet
    (ASME, 2017) Akkuş, Y.; Çetin, Barbaros; Dursunkaya, Z.
    In this study, a computational model for the evaporation from a sessile liquid droplet fed from the center to keep the diameter of the droplet constant is presented. The continuity, momentum and energy equations are solved with temperature dependent thermo-physical properties using COMSOL Multi-physics. At the surface of the droplet, convective heat and evaporative mass fluxes are assigned. Since the flow field is affected by evaporative flux, an iterative scheme is built and the computation is automated using COMSOL-MATLAB interface. Correlations are implemented to predict the convective heat transfer coefficients and evaporative flux. Three different wall temperatures are used in simulations. The results show that the flow inside the droplet is dominated by buoyancy when the effect of the thermo-capillarity is neglected. The resulting flow generates a circulation pattern emerging from the entrance to the apex, along the surface of the droplet to the bottom heated wall and back to the entrance.