If you guys are so worried about fluid velocity in your channels how come you use such large channels?
I personally made my WB by using the smallest milling bit the operator would let me. And I do not believe parallel channels are effective because surface area in a waterblock is not as critical as fluid velocity. (I did a quick heat transfer calc)
I believe the increased velocity by using a series maze style waterblock with many small channels in series overcomes the loss in flow rate due to the pressure drop over the waterblock.
I think velocity in the WB is important not flow rate.
To achieve this end I would suggest smaller fluid channels in series rather than different configurations.
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