Re: [Shop-talk] Hot/Cold drain

["Mullen, Tim" <Tim.Mullen@ngc.com>]

Randal wrote:

> I'm guessing it has nothing to do with how warm the water going
> into the drain is; but rather that hot+cold flows in faster than
> cold alone and is also more turbulent/traps more air.  My bathroom
> sink does the same thing.


Randall is apparently correct.

It was all a matter of perception.

In a "controlled" experiment, the sink was filled with cold water and
drained.  Then filled with hot water and drained.  It was repeated
several times.

It took the same time to drain under all the conditions.

I suspected that the flow rate was higher for hot and cold combined (or
just the hot alone) and apparently that was it.  But I figured I'd ask
the list just in case there could be some weird reason that hot went
down the drain slower.


Tim Mullen
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