Air at 27°C, 1 atm flows parallel to a flat plate, which is electronically heated. The plate is 0.5 m long in the direction of f
low. The uniform heat flux from the plate to the air is 3,000 W/m². A trip wire placed at the leading edge of the plate ensures that the boundary layer is turbulent over the entire plate. A thermocouple mounted at the trailing edge of the plate records a temperature of 127°C. Consider the following:
a) Determine the local Nusselt number Nuy at the trailing edge of the plate.
b) Calculate the Reynolds number Rex at the trailing edge of the plate.
c) Evaluate the air free stream velocity (m/s).
a) Determine the local Nusselt number Nuy at the trailing edge of the plate.
b) Calculate the Reynolds number Rex at the trailing edge of the plate.
c) Evaluate the air free stream velocity (m/s).
1 answer:
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Answer:
Explanation:
From the question we are told that:
Zener diode Voltage
Zener diode Current
Note
Supply Voltage
Reduction Percentage
Generally the equation for Kirchhoff's Voltage Law is mathematically given by
Therefore
Generally the equation for Kirchhoff's Current Law is mathematically given by
Therefore
Answer:
(a) 65.04%
(b) 16.91%
Solution:
As per the question:
At inlet:
Pressure of the compressor, P = 140 kPa
Temperature, T = = 263 K
Isentropic work, W = 700 kPa
At outlet:
Pressure, P' = 700 kPa
Temperature, T' = = 333 K
Now, from the steam table;
At the inlet , at a P = 700 kPa, T =:
h = 243.40 kJ/kg, s = 0.9606 kJ/kg.K
At outlet, at P = 140 kPa, T =:
h' = 296.69 kJ/kg, s' = 1.0182 kJ/kg.K
Also in isentropic process, s = and
at 700kPa
(a) Isentropic efficiency of the compressor,
(b) The temperature of the environment, = 273 + 27 = 300 K
Availability at state 1,
Similarly for state 2,
Now, the efficiency of the compressor as per the second law;
= 67.57%