ChBE421 Problem Set #3 Fall 2015
Assigned: 09/15/2015
Due: 09/22/2015
1. What assumption must be made to simplify the Integral Energy Balance into
Bernoulli’s Equation?
2. Sea water (S.G. 1.025) ﬂows through a 90° reducing elbow as shown in the diagram.
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ChBE421
Test #1
Fall 2009
1. (25 pts) Answer briefly (5 pts) Consider a ball (dimension L) thrown at a defined velocity (U). If the density of the liquid through which the ball is thrown is doubled while the viscosity is reduced by 1/3, does the flow beco
ChBE421
Assigned: 9/6/2011
Due: 9/13/2011
Problem Set #2v2
Fall 2011
1. Water flows from the bottom of a large tank where the pressure is 95 psia to a turbine,
located 65 ft below the bottom of the tank, that produces 45 hp. The pressure at the turbine
ex
ChBE421
Assigned: 10/09/2012
Due: 10/16/2012
Problem Set #5
Fall 2012
1. Answer briefly:
a. Consider the boundary layer on a flat plate in uniform flow. Shear stress: = u/y.
If we triple the viscosity, by how much will the shear stress change?
b. For lami
ChBE421
Problem Set # 9
Fall 2009
1. A shell and tube heat exchanger having two shell passes and eight tube passes is used to heat kerosene from 20 C to 75 C. The kerosene (CP = .49 kcal/kg C) enters at a rate of 950 kg/hr. Water at 98 C flows through the
ChBE421
Problem Set #2 Solutions
Fall 2009
1.
& W 1 P (v 2 ) + gz + + lw + s = 0 & 2 m
where: z = 0, P = 0, lw = 0
& m & W s = (v 2 ) 2 = -0.5 x (1.2 kg/m3) x (14 m/s) x (/4(25 m)2) x [(5 m/s)2 (14 m/s)2] = 0.705 MW
2.
d P & edV = Q W S E u ndS dt V
whe
ChBE421
Assigned: 9/27/2011
Due: 10/6/2011
Problem Set #4
Fall 2011
1. Two immiscible fluids of different density and viscosity are flowing between two parallel
plates. Express the boundary conditions at the interface between the two fluids.
2. Consider t
Problem Set #7 Solutions
1. In designing a spray coating system, it is known that the behavior of a droplet as it
strikes the surface is a function of liquid density, viscosity, surface tension, droplet
size, droplet velocity, and surface roughness (chara
ChBE421
Problem Set #4
Fall 2009
1. Consider the problem of laminar, unidirectional flow in a pipe of radius a that we worked through in class (remember to include viscosity!). Solve for the velocity profile, u(r), in the pipe (in terms of p) Calculate th
ChBE 421
Problem Set #6 Solution
Fall 2009
1. The variables involved are: , , , D, v, e Using the Buckingham theorem, we will get 3 different dimensionless groups. Since the problem gives relations for , and , well use these as the core variables. Hence,
CHBE421 Exam 3
<Please answer all questions in the spaces provided>
December 2, 20] l
50 UK)
Name:
Section:
CLOSED-BOOK; CLOSED-NOTES; CALCULATORS ALLOWED
CELL PHONES MUST BE KEPT IN BAGIPOCKET AT ALL TIMES
PLEASE CONFI YOUR E AM HAS 9 PAGES
Time-Temper
ChBE 421
Problem Set #2
Fall 2008
1
A rigid fixed plate is struck by a jet of water and deflects the jet by an angle of 30 as shown on next
page. The liquid surface of the jet is at atmospheric pressure everywhere except where it strikes the
plate. The in
ChBE421
Problem Set #2
Fall 2009
1. In this era of high energy prices, there is a focus on renewable sources of energy such as wind energy. Consider a large windmill 30m in diameter. On a windy day, suppose that the windmill entrains a stream of air 25 m
ChBE421
Problem Set #3
Fall 2009
1. A hovercraft is a vehicle which floats on a cushion of air. In a simplified design as illustrated below, the craft has an air intake 7 ft in diameter through which air enters at 72 ft/sec, and p = pATM. The air discharg
ChBE421
Due: 10/11/2011
Problem Set #5
Fall 2011
1. For flow at very low speeds and with large viscosity, (the so-called creeping flows) such as
occur in lubrication, it is possible to delete the inertia terms, Dv/Dt, from the Navier-Stokes
equation. For
ChBE421
Assigned: 09/1/2015
Due: 09/8/2015 ChBE421
Problem Set #1
Fall 2015
Problem Set #1
Assigned: 8/31/2010
Due: 9/9/2010
1. What is the difference in pressure between tanks A and B, if d1 = 1m, d2 = 0.5m, d3 =
1.5m, d4 =
2
? Density of water and mercu
ChBE421
Final Exam
Dec. 10, 2009
1. (45 pts) Please answer 9 (5pts/ea) out of the 14 questions. Answer each briefly a. A metal pipe wrapped with a layer of insulation is carrying condensing steam at temperature To in a room at temperature T. If the thickn
ChBE421
Problem Set #5
Fall 2009
1. Evaluate the stress tensor ij for each of the following flows (, R: constants).
a. p = 0, u = 0.6x, v = -0.3y, w = -z b. p = 0, u = 0, v = -x2, w = 0 c. p = Rx, = (2 + 2 ), v = 0, w = 0
2
Sketch the velocity profile for
ChBE421
Problem Set #7
Fall 2009
1. Nitrogen at 50 C flows through a packed bed of particles at a rate of 200 kg/hr. The bed is 13 cm in diameter, 36 cm high and has porosity 0.48. The particles have specific surface 8.1 cm1. Find the pressure drop 2. A c