Actually, what you originally said was vague. And to calculate heat transfer in this instance, you do not need to know mass. There are many ways to calculate heat transfer. One option is to measure mass flow rate and delta-T and multiply by the specific heat. Another is to measure energy consumption directly. Given a choice between the two, you'd quickly find it's a lot easier to accurately measure electrical usage than the required properties to determine heat transfer via the water directly.
Irrespective of both velocity and mass flow rate, if a cooling system is able to operate in a steady-state condition then it is capable of removing all heat from the heat source. I believe this is likely the main reason why Bill stated you were incorrect. Specifically referring to your prior post, how much water flows has virtually zero bearing on the amount of heat transferred in a water cooled PC.
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