Fundamentals of Momentum, Heat and Mass Transfer
6th Edition
ISBN: 9781118804292
Author: WELTY
Publisher: DGTL BNCOM
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Question
Chapter 2, Problem 2.19P
(a)
Interpretation Introduction
Interpretation:
The minimum height h for which the gate with rectangular cross section with rotate in clockwise direction is to be determined.
Concept Introduction:
The force
acting on a surface due to a fluid above it is defined as:
Here,
Moment of force
is the effect of the force applied at a particular distance from the axis of rotation on a rotational system which leads to its rotation. Mathematically it is written as:
Here,
(b)
Interpretation Introduction
Interpretation:
The minimum height h for which the gate with triangular cross section with rotate in clockwise direction is to be determined.
Concept Introduction:
The force
acting on a surface due to a fluid above it is defined as:
Here,
Moment of force
is the effect of the force applied at a particular distance from the axis of rotation on a rotational system which leads to its rotation. Mathematically it is written as:
Here,
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2. A single-effect evaporator is concentrating a feed solution of organic colloids from 5 to 50 wt
%. The solution has a negligible boiling point elevation. The heat capacity of the feed is cp
.
4.06 kJ/kg K and the feed enters at 15.6 °C. Saturated steam at 101.32 kPa is available for
heating, and the pressure in the vapor space of the evaporator is 15.3 kPa. A total of 4536 kg/h
of water is to be evaporated. The overall heat-transfer coefficient is 1988 W/m². K. What is
the required surface area in m² and the steam consumption?
A mixture with 4% n-pentane, 40% n-hexane, 50% n-heptane, and 6% n-octane is to
be distilled at 14.7 lb/in² (1 atm.) with 98% of the hexane and 1% of the heptane
recovered in the distillate. If the liquid feed is a saturated liquid (i.e., q = 1). Calculate
i.) The product compositions, ii.) The top and bottom temperature iii.) Minimum
reflux ratio (Rm), iv.) Minimum theoretical plates and v.) Actual plates when the
reflux ratio is 2Rm.
Table 1: Component boiling point and molar mass
Component
Boiling point
n-C5
97°F
n-C6
156.2°F
n-C7
209.1°F
n-C8
258.1°F
Molar mass
72.2
86.2
100.2
114.2
Hint: Since 1% of heptane is specified to be recovered in the distillate, 99% of
heptane is to be recovered in the bottom.
H.W
1. A plant wishes to dry a certain type of fiberboard. To determine drying characteristics, a
sample of 0.3 × 0.3 m with edges sealed was suspended from a balance and exposed to a
current of hot dry air. The initial moisture content was 75%. The sheet lost weight at the rate
of 1 104 Kg/s unit the moisture content fell to 60%. It was established that the equilibrium
moisture content was 10 %. The dry mass of the sample was 0.90 Kg. All moisture contents
were on a wet basis. Determine the time for drying the sheets from 75% to 20% moisture
under the same drying conditions?
Chapter 2 Solutions
Fundamentals of Momentum, Heat and Mass Transfer
Ch. 2 - Prob. 2.1PCh. 2 - Prob. 2.2PCh. 2 - Prob. 2.3PCh. 2 - Prob. 2.4PCh. 2 - Prob. 2.5PCh. 2 - Prob. 2.6PCh. 2 - Prob. 2.7PCh. 2 - Prob. 2.8PCh. 2 - Prob. 2.9PCh. 2 - Prob. 2.10P
Ch. 2 - Prob. 2.11PCh. 2 - Prob. 2.12PCh. 2 - Prob. 2.13PCh. 2 - Prob. 2.14PCh. 2 - Prob. 2.15PCh. 2 - Prob. 2.16PCh. 2 - Prob. 2.17PCh. 2 - Prob. 2.18PCh. 2 - Prob. 2.19PCh. 2 - Prob. 2.20PCh. 2 - Prob. 2.21PCh. 2 - Prob. 2.22PCh. 2 - Prob. 2.23PCh. 2 - Prob. 2.24PCh. 2 - Prob. 2.25PCh. 2 - Prob. 2.26PCh. 2 - Prob. 2.27PCh. 2 - Prob. 2.28PCh. 2 - Prob. 2.29PCh. 2 - Prob. 2.30PCh. 2 - Prob. 2.31PCh. 2 - Prob. 2.32P
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