Experimental Investigation of Phase Change inside a Finned-Tube Heat Exchanger

Table 2

Reynolds numbers for different flow rates and temperature values.

		Inlet HTF temperature
		50	60	70
Flow rate	0.2	433	507	586
	0.4	866	1015	1173
	0.6	1299	1522	1759
	1.6	3465	4059	4692

The italic cells refer to the inputs applied in the experiment. Since the critical Reynolds number for a flow inside tube is 2300, values above this number mean the flow is turbulent, whereas less values lead to laminar flow. It can be inferred from the table that as far as mass flow rates are 0.2, 0.4, and 0.6, the flow regime is laminar. But when the flow rate reaches to 1.6 flow regime becomes turbulent.