If the plate temperature is 170°C and the gas temperature is 30°C, calculate (a) the average heat transfer coefficient, (b) the rate of heat transfer between the plate and the gas and (c) the local heat flux 2 m from the leading edge.

The heat transfer coefficient for a gas flowing over a thin flat plate 3-m-long and

0.3-m-wide varies with distance from the leading edge according to



GIVEN

• Gas flowing over a 3-m-long by 0.3-m-wide flat plate

• Heat transfer coefficient (hc) is given by the equation above

• The plate temperature (TP) = 170°C

• The gas temperature (TG) = 30°C

FIND

(a) The average heat transfer coefficient ( h c) (b) The rate of heat transfer (qc) (c) The local heat flux at x = 2 m (qc (2)/A)

ASSUMPTIONS

• Steady state prevails

SKETCH


(a) The average heat transfer coefficient can be calculated by



(b) The total convective heat transfer is given by



(c) The heat flux at x = 2 m is

Physics & Space Science

You might also like to view...

In brittle ceramics, the fracture strength is lower than the _________strength.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

RC Circuits: A circuit contains a 2.0-M? resistor in series with an uncharged capacitor. When this combination is connected across an ideal battery, the capacitor reaches 25% of its maximum charge in 1.5 s. What is its capacitance?

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

A ball hangs at rest from a string attached to the ceiling. The string pulls up on the ball with a force equal to its weight. The reaction to the upward force of the string on the ball is a ________ (direction) force exerted by the ________ on the ________.

What will be an ideal response?

Physics & Space Science

Two electrons are apart at closest approach. What is the magnitude of the maximum electric force that they exert on each other? (e = 1.60 × 10-19 C, k = 1/4??0 = 9.0 109 N ? m2/C2 )

A) 5.8 × 10-25 N B) 2.3 × 1010 N C) 2.3 N D) 5.8 × 10-27 N

Physics & Space Science