The geometry configuration of the problem is as shown in Fig. 1.
The hot and cold microtubes were placed in the middle of a
20d 20d sized square, where d is the diameter of the microtube,
and the distance between the two microtubes or tube spacing is
1.5d. All the solid boundaries were given as no slip boundary. The
hot and cold tubes were at constant temperatures, and given by 2
and 1, respectively. The enclosure wall was adiabatic, and its initial
temperature was given by the averaged hot and cold tube temperature
of 1.5.
For the homogenous fluid in an enclosure, the dimensionless
governing equations for describing the natural convection in two
dimensional can be given as follows
The geometry configuration of the problem is as shown in Fig. 1.The hot and cold microtubes were placed in the middle of a20d 20d sized square, where d is the diameter of the microtube,and the distance between the two microtubes or tube spacing is1.5d. All the solid boundaries were given as no slip boundary. Thehot and cold tubes were at constant temperatures, and given by 2and 1, respectively. The enclosure wall was adiabatic, and its initialtemperature was given by the averaged hot and cold tube temperatureof 1.5.For the homogenous fluid in an enclosure, the dimensionlessgoverning equations for describing the natural convection in twodimensional can be given as follows
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