1:1

2:1

1:2

4:1

Grashoff number

Nusselt number

Weber number

Prandtl number

higher

lower

same

depends on the area of heat exchanger

cold water inlet and outlet

hot medium inlet and outlet

hot medium outlet and cold water inlet

hot medium outlet and cold water outlet

both the fluids at inlet (of heat ex¬changer where hot fluid enters) are in their coldest state

both the fluids at inlet are in their hot¬test state

both the fluids .at exit are in their hottest state

one fluid is in hottest state and other in coldest state at inlet