CBE 332 QQ2

The average Sherwood number for a surface of characteristic length L is formed from which collection of variables

(h barm * L)/ Dab

To convert a Sherwood correlation into a relationship good for predicting heat transfer characteristics, one can simply replace the Schmidt number with the ________ number and the Sherwood number with the _______ number.

Prandtl, Nusselt

Assuming one could trip the boundary layer on a flat plate into turbulence at any location x along the plate that one wanted, to absolutely maximize heat or mass transfer one should trip the boundary layer into turbulence at the very front edge of the plate (x=0).

false!

The heat and mass transfer analogy says that if the Nusselt and Sherwood numbers for two geometricaly analogous systems are equivalent, the heat transfer and mass transfer coefficients for those systems will be identical.

false!

The average Nusselt number for a surface of characteristic length L is formed from which collection of variables:

hbar*L/kf

Boundary layer separation for a cylinder in cross-flow ______________.

is attributed to an increasing pressure field acting on the fluid as it moves around the cylinder .

A typical value for C2, the correction factor for banks of tubes with less than 20 rows, is _______ to _________.

less than 1, avoid overestimating the value of the heat transfer coefficient

The Reynolds number used to predict the type of flow in the boundary layer region over a flat plate depends on the distance from the plate's front edge.

true!

When considering flow over an aligned bank of tubes with an initial Reynolds number maximum of 105, doubling the ____________ will be least likely to increase the pressure drop associated with flow through the system.

tubes in a row at the same spacing