FLUID MECHANICS-EBOOK>I<
2nd Edition
ISBN: 2819480256061
Author: HIBBELER
Publisher: INTER PEAR
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Chapter 8, Problem 23P
To determine
The relation between
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As shown in the figure below, moist air at T₁ = 36°C, 1 bar, and 35% relative humidity enters a heat exchanger operating at steady state
with a volumetric flow rate of 10 m³/min and is cooled at constant pressure to 22°C. Ignoring kinetic and potential energy effects,
determine:
(a) the dew point temperature at the inlet, in °C.
(b) the mass flow rate of moist air at the exit, in kg/min.
(c) the relative humidity at the exit.
(d) the rate of heat transfer from the moist air stream, in kW.
(AV)1, T1
P₁ = 1 bar
11
= 35%
120
T₂=22°C
P2 = 1 bar
Air at T₁-24°C, p₁-1 bar, 50% relative humidity enters an insulated chamber operating at steady state with a mass flow rate of 3
kg/min and mixes with a saturated moist air stream entering at T₂-7°C, p2-1 bar. A single mixed stream exits at T3-17°C, p3-1 bar.
Neglect kinetic and potential energy effects
Step 1
Your answer is correct.
Determine mass flow rate of the moist air entering at state 2, in kg/min.
m2 = 2.1
Hint
kg/min
Using multiple attempts will impact your score.
5% score reduction after attempt 2
Step 2
Determine the relative humidity of the exiting stream.
Փ3 =
i
%
Attempts: 1 of 3 used
A reservoir at 300 ft elevation has a 6-in.-diameter discharge pipe located 50 ft below the surface. The pipe is 600 ft long and drops in elevation to 150 ft where the flow discharges to the atmosphere. The pipe is made of riveted steel with a roughness height of 0.005 ft.
Determine the flow rate without a head loss
Determine the flow rate with the pipe friction head loss.
(hints: Since the velocity is not known for part b and the Reynolds number and friction factor depend on velocity, you will need to iterate to find the solution. A good first guess is the velocity from part (a))
Chapter 8 Solutions
FLUID MECHANICS-EBOOK>I<
Ch. 8 - Prob. 1PCh. 8 - Prob. 2PCh. 8 - Prob. 3PCh. 8 - Prob. 4PCh. 8 - Prob. 5PCh. 8 - Prob. 6PCh. 8 - The pressure change that occurs in the aortic...Ch. 8 - Express the group of variables L, μ, ρ, V as a...Ch. 8 - Prob. 9PCh. 8 - Prob. 10P
Ch. 8 - Prob. 11PCh. 8 - Prob. 12PCh. 8 - Prob. 13PCh. 8 - The speed of sound V in air is thought to depend...Ch. 8 - Prob. 15PCh. 8 - Prob. 16PCh. 8 - Prob. 17PCh. 8 - Prob. 18PCh. 8 - The discharge Q over the weir A depends upon the...Ch. 8 - Prob. 20PCh. 8 - Prob. 21PCh. 8 - Prob. 22PCh. 8 - Prob. 23PCh. 8 - Prob. 24PCh. 8 - As the liquid drains from the pipette, the exit...Ch. 8 - The discharge Q from a turbine is a function of...Ch. 8 - The flow of air Q through the fan is a function of...Ch. 8 - The drag FD on the square plate held normal to the...Ch. 8 - Prob. 29PCh. 8 - Prob. 30PCh. 8 - Prob. 31PCh. 8 - The head loss hL in a pipe depends upon its...Ch. 8 - Prob. 33PCh. 8 - The change in pressure Δp in the pipe is a...Ch. 8 - The drag FD on the automobile is a function of its...Ch. 8 - Prob. 36PCh. 8 - Prob. 37PCh. 8 - The diameter D of oil spots made on a sheet of...Ch. 8 - Prob. 39PCh. 8 - The height H of water as it passes over a small...Ch. 8 - Water and crude oil flow through the pipes with a...Ch. 8 - Prob. 42PCh. 8 - If the water in a river is flowing at 16 ft/s, and...Ch. 8 - Prob. 44PCh. 8 - Prob. 45PCh. 8 - Prob. 46PCh. 8 - Prob. 47PCh. 8 - Prob. 48PCh. 8 - The flow of water around the structural support is...Ch. 8 - If the drag on a 15-m-long airplane is to be...Ch. 8 - Prob. 51PCh. 8 - A 15-ft-long submarine is intended to travel at 15...Ch. 8 - The flow of water around the bridge pier is to be...Ch. 8 - Prob. 54PCh. 8 - Prob. 55PCh. 8 - Prob. 56PCh. 8 - Prob. 57PCh. 8 - Prob. 58PCh. 8 - The jet plane can fly at Mach 2 in 40°F air. What...Ch. 8 - Prob. 60PCh. 8 - The drag coefficient on an airplane is defined by...Ch. 8 - Prob. 62PCh. 8 - Prob. 63PCh. 8 - Prob. 64PCh. 8 - A ship has a length of 180 m and travels in the...
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- Air at T₁-24°C, p₁-1 bar, 50% relative humidity enters an insulated chamber operating at steady state with a mass flow rate of 3 kg/min and mixes with a saturated moist air stream entering at T₂-7°C, p2-1 bar. A single mixed stream exits at T3-17°C, p3-1 bar. Neglect kinetic and potential energy effects Step 1 Your answer is correct. Determine mass flow rate of the moist air entering at state 2, in kg/min. m2 = 2.1 Hint kg/min Using multiple attempts will impact your score. 5% score reduction after attempt 2 Step 2 Determine the relative humidity of the exiting stream. Փ3 = i % Attempts: 1 of 3 usedarrow_forward25 mm Brass core E = 105 GPa 0 = 20.9 x 10 °C PROBLEM 2.49 The aluminum shell is fully bonded to the brass core and the assembly is unstressed at a temperature of 15°C. Considering only axial deformations, determine the stress in the aluminum when the temperature reaches 195°C. 60 mm Aluminum shell E = 70 GPa a = 23.6 × 10°Carrow_forwardThis is an old practice exam. The answers are OAB = 19.10 ksi OBC = 2.228 ksi OCD = −2.865 ksi v = 0.2792delta Ltot = 0.01585 in (increase) but whyarrow_forward
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