Table 2: Values of and for , and various Pr.

Pr Buoyancy assisting flow Buoyancy opposing flow

0 0.604 0.200 0.200
0.72 0.419 0.702 0.647
6.8 0.219 2.101 2.059
20 0.145 3.584 3.552
40 0.109 5.058 5.034
60 0.091 6.191 6.169
80 0.080 7.146 7.127
100 0.072 7.987 7.970
200 0.053 11.290 11.277
400 0.038 15.962 15.953
1000 0.024 25.234 25.228