Reynolds Number for Moving Wire
Reynolds Number for Moving Wire
(OP)
I am wondering how you calculate the Reynolds Number, Re, for wire moving in a fluid. What characteristic dimension do you use; and what criteria do you use to determine a turbulent state?
My approach would be to use
Re = vD/viscosity(k)
v = velocity of wire
D = diameter of wire
viscosity(k) = kinematic viscosity
And to use the criteria for flow over a flat plate. Does anyone have any experience with this?
Thank You
Don
dleffingwell@snet.net
My approach would be to use
Re = vD/viscosity(k)
v = velocity of wire
D = diameter of wire
viscosity(k) = kinematic viscosity
And to use the criteria for flow over a flat plate. Does anyone have any experience with this?
Thank You
Don
dleffingwell@snet.net





RE: Reynolds Number for Moving Wire
RE: Reynolds Number for Moving Wire
There are many references on the Internet for hot-wire anemometers, in which the flow is perpendicular to a cylinder. One site actually gives expressions for varying the flow from 90 degrees to almost parallel.
Thanks again for your input.
Donald Leffingwell
dleffingwell@snet.net
This site gives relationships for varying yaw angles
http://www2.eng.cam.ac.uk/~hph/current-research/hph/hot-wire/hot-wire.html
This site is titled: "Free and Forced Convection from a Heated Cylinder". It uses experimental data and theory to demonstrate the concepts.
http://www.me.wustl.edu/ME/labs/thermal/me372b3.htm
Both are very good.
RE: Reynolds Number for Moving Wire
RE: Reynolds Number for Moving Wire