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From: drabik@sdccs7.UUCP
Newsgroups: net.physics
Subject: Hot Wire Anemometers
Message-ID: <1269@sdccs7.UUCP>
Date: Wed, 1-Aug-84 08:33:39 EDT
Article-I.D.: sdccs7.1269
Posted: Wed Aug  1 08:33:39 1984
Date-Received: Sat, 4-Aug-84 01:35:05 EDT
Organization: U.C. San Diego, Computer Center
Lines: 22

Hot wire anemometers are being used to measure mass flow rate of intake
air in many modern automobile engines.  The operation of these devices
depends on the properties of heat transfer by forced convection past a
body (e.g. a circular cylinder).  Can anyone tell me what the functional
dependence is of heat flow with respect to temperature of the cylinder,
temperature of the ambient air, velocity of the air, and density of the
air (at low Reynolds numbers), that is, in

	dQ/dt = f (v, rho, Ta, Tw),

what is the form of f?  It seems that, by being clever, one can use only
one (or maybe two) wires and measure mass flow directly.  This I would
like to know.


					Thanks in advance,

					Tim Drabik
					...sdccs7!drabik
					UCSD EECS