Register to reply

Turbulent heating of water.

by flatmaster
Tags: heating, turbulent, water
Share this thread:
Aug22-14, 07:49 PM
P: 505
I am writing an intro physics problem about a flowing stream. I am going to assume that all of the gravitational potential energy eventually becomes thermal energy of the water. I haven't worked it yet, but I'm pretty sure the flow rate and g will both cancel out and give me a constant change in temperature per unit of elevation change.

Is there a specific name for this phenomenon?

How reasonable of an assumption is this? Some energy must go into eroding rock, making noise, etc.
Phys.Org News Partner Earth sciences news on
Aug22-14, 08:29 PM
P: 840
I'm not sure which phenomenon you're specifically trying to name. Turbulent dissipation? Turbulent heating?

It doesn't seem that unreasonable for an "idealized" problem. In real life you would have some competing effects that would probably overwhelm the turbulent heating, including the gain in kinetic energy of the stream flow and heat exchange between the stream and the surroundings (especially the atmosphere which also tends to warm with decreasing elevation).

And sure, some energy might be lost to eroding/heating rocks, radiate away as acoustic or seismic waves to eventually heat something else, etc.

Register to reply

Related Discussions
Heating Water Engineering, Comp Sci, & Technology Homework 4
Water heater warms 137 kg water from 20C to 45 C in 16 min. - Heating element resist? Introductory Physics Homework 2
HELP!: heating a pot of water on low or high water. Introductory Physics Homework 4
Heating water Help! Introductory Physics Homework 3
Heating water General Physics 1