Q1/ An orifice meter is to be calibrated for the measurement of the flow rate of a stream of liquid acetone. The differential manometer fluid has a specific gravity of 1.10. The calibration is accomplished by connecting the orifice meter in series with a rotameter that has previously been calibrated for acetone, adjusting a valve to set the flow rate, and recording the flow rate (determined from the rotameter reading and the rotameter calibration curve) and the differential manometer reading, h. The procedure is repeated for several valve settings to generate an orifice meter calibration curve of flow rate versus h. The following data are taken.
Q1/ An orifice meter is to be calibrated for the measurement of the flow rate of a stream of liquid acetone. The differential manometer fluid has a specific gravity of 1.10. The calibration is accomplished by connecting the orifice meter in series with a rotameter that has previously been calibrated for acetone, adjusting a valve to set the flow rate, and recording the flow rate (determined from the rotameter reading and the rotameter calibration curve) and the differential manometer reading, h. The procedure is repeated for several valve settings to generate an orifice meter calibration curve of flow rate versus h. The following data are taken.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Q1/
An orifice meter is to be calibrated for the measurement of the flow rate of a stream of
liquid acetone. The differential manometer fluid has a specific gravity of 1.10. The calibration
is accomplished by connecting the orifice meter in series with a rotameter that has
previously been calibrated for acetone, adjusting a valve to set the flow rate, and recording
the flow rate (determined from the rotameter reading and the rotameter calibration curve)
and the differential manometer reading, h. The procedure is repeated for several valve
settings to generate an orifice meter calibration curve of flow rate versus h. The following
data are taken.
VALVEX
Flow Rate V (mL/s)
Manometer Reading
h(mm)
5
62
87
10
107
20
123
25
138
151
30
1- For each of the given readings, calculate the pressure drop across the orifice, AP (mm
Hg).
2- The flowrate through an orifice should be related to the pressure drop across the
orifice by the formula.
V = KP"
Verify graphically that the given orifice calibration data are correlated by this
relationship, and determine the values of K and n that best fit the data.
3- Suppose the orifice meter is mounted in a process line containing acetone and a
reading h = 23 mm is obtained. Determine the volumetric, mass, and molar flow rates
of acetone in the line.
Q2/
A thermostat control with dial markings from 0 to 100 is used to regulate the
temperature of an oil bath. A calibration plot on logarithmic coordinates of the temperature,
T (°F), versus the dial setting, R, is a straight line that passes through the points (R1 = 20.0,
T1 =110.0 °F) and (R2 = 40.0, T2 = 250.0 °F).
(a) Derive an equation for T (°F) in terms of R.
(b) Estimate the thermostat setting needed to obtain a temperature of 320°F.
Sheet 1
Page 2 of 2
Q3/
Convert the temperatures in Parts (a) and (b) and temperature intervals in Parts (c) and
(d):
a) T= 85 °F to °R, °C, K
b) T=- 10°C to K, °F, °R
c) AT = 85 °C to K, °F, °R
d) AT = 150 °R to °F, °C, K
Q4/
A liquid mixture is prepared by combining N different liquids with densities pi; p2; ...;
Py. The volume of component i added to the mixture is V., and the mass fraction of this
component in the mixture is x. The components are completely miscible. The following two
formulas provide estimates of the density of the liquid mixture, p, if the volume of the
mixture equals the sum of the pure-component volumes. Only one of the formulas is correct,
however.
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