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Originally Posted by Les
Commiserations
A testing experience.
Plus some progress on theory and data manipulation.
Have a beer .
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Originally Posted by Cather
I think most of us have been there at some point or another.
Have learned that whenever I find something that seems exceptional, I then immediately throw an old known block on to retest the calibration. As a habit now I alternate tests between a known reference block and a new block.
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Well, I've had the day to sulk and now, beer in hand on the strength of what I am sure is good advice, I'm reflecting on the situation.
First step is to get the die sim up and running in a sensible, reliable fashion.
I am ordering some Betatherm miniature thermistors, I have the parts to assemble what will be a fairly high spec data aquisition/control unit to capture temperature, pressure and flowrate and control pumps. I have a Swissflow flowmeter on line already and the 2ohm heater resistor just needs a die of an established footprint instead of the Barton sized one I have been using to fit the Fluxblock:
When this is in place I will move on with the block.
Despite the debacle I find myself having generated, I think the fundamental principle for this block is sound.
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Originally Posted by Les
... it conveys the point that I am not convinced a high h(eff) is maintained.
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I believe you are probably right Les. However I am figuring that if I can get it up to 30000 the block will perform well. Heres a "to scale" drawing of the block as measured. You can probably refine your calculation from it if you don't feel it a waste of time under the circumstances.
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Originally Posted by Cather
It must also be said that as one moves further away from the center that water velocity will drop quite rapidly unless the clearances are progressively altered, such as fitting a parabolic bowl atop the hemisphere.
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Definitely Cather. The current design does do this, but a machining balls-up (I make quite a few of these) means it is not quite the way I intended, the clearances are a little bigger, 0.8 instead of 0.4mm at the outer rim.