P1: IWV CB908/Date 0 521 85326 5 0521853265c05 150 2D CONVECTION – CARTESIAN GRIDS GR = 10 GR = 500 May 20, 2005 12:28 GR = 2000 5.0 2.5 Figure 5.20. Contours of ω (at an interval of 0.05) and velocity vectors for natural convection evapo- ∗ ration.