Consider parallel flow over a flat plate for air at 300 K and engine oil at 380
Question:
Consider parallel flow over a flat plate for air at 300 K and engine oil at 380 K. The free stream velocity is u∞ = 2 m/s. The temperature difference between the surface and the free stream is the same in both cases, with Ts = T∞.
(a) Determine the location where transition to turbulence occurs, xc, for both fluids.
(b) For laminar flow over a flat plate, the velocity boundary layer thickness is given by
Calculate and plot the velocity boundary layer thickness δ over the range 0 ≤ x ≤ xc for each fluid.
(c) Calculate and plot the thermal boundary layer thickness δt for the two fluids over the same range of x used in part (b). At an x-location where both fluids experience laminar flow conditions, explain which fluid has the largest temperature gradient at the plate surface, –∂T/∂yy=0. Which fluid is associated with the largest local Nusselt number Nu? Which fluid is associated with the largest local heat transfer coefficient h?
Step by Step Answer:
Fundamentals Of Heat And Mass Transfer
ISBN: 9780470501979
7th Edition
Authors: Theodore L. Bergman, Adrienne S. Lavine, Frank P. Incropera, David P. DeWitt