Circuit Reynolds number result

The Circuit Reynolds number result shows the Reynolds number of the coolant in the cooling circuit.

Using this result

When turbulent flow has been achieved, an increase in flow rate makes little difference to the rate of heat extraction; therefore, flow rate should only be set to achieve the ideal Reynolds number with minimum variations.

If you enter a minimum Reynolds number, use 10,000 as a minimum, and then check this result to ensure minimum variation. Do not aim for a Reynolds number that is greater than 10,000.

If you have parallel cooling channel circuits, it may be difficult to achieve minimum variation of the Reynolds number throughout all branches of the parallel circuit. If this is the case, consider changing the circuit layout. A Reynolds number below 4000 can be laminar and this will be less effective at removing heat from the cavity.

If there is a large variation in cooling channel diameter, there may be excessive variations in the Reynolds number. If this occurs, either adjust the cooling channel diameter, or reduce the minimum Reynolds number, ensuring the Reynolds number is always greater than 4000.

Things to look for

When viewing the Circuit Reynolds number result, watch for the following:

• The Reynolds number should be greater than 4,000 for lines actively involved in cooling the part to ensure there is turbulent flow within the circuits and hence efficient cooling.
• The ideal Reynolds number to achieve is 10,000.