Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780132558921
Author: Robert L. Mott, Joseph A. Untener
Publisher: PEARSON
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Chapter 2, Problem 2.61PP
In a falling-ball viscometer, a steel ball 1.6 mm in diameter is allowed to fall freely in a heavy fuel oil having a specific gravity of 0.94. Steel weighs
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A rotating cup viscometer has an inner cylinder diameter of 50.8mm, and the gap between cups is
5.08mm. The inner cylinder length is 63.5mm. The viscometer is used to obtain viscosity data on a
Newtonian liquid. When the inner cylinder rotates at 10 rev/min, the torque on the inner cylinder
is measured to be 0.01243mN - m. Calculate the viscosity of the fluid. If the fluid density is 850 kg/
m^3, calculate the kinematic viscosity.
A concentric cylinder viscometer is driven by a falling mass M connected by a cord and pulley to the inner cylinder. Annular gap of width a and height H has been filled with liquid to be tested. The speed of the falling mass is Vm. Develop an algebraic expression for the viscosity of the liquid. Evaluate the viscosity of the liquid using M= 0.1 Kg, R=50mm, H=80 mm, r=25mm, a=0.20mm and Vm = 94
Chapter 2 Solutions
Applied Fluid Mechanics (7th Edition)
Ch. 2 - Define shear stress as it applies to a moving...Ch. 2 - Define velocity gradient.Ch. 2 - State the mathematical definition for dynamic...Ch. 2 - Which would have the greater dynamic viscosity, a...Ch. 2 - State the standard units for dynamic viscosity in...Ch. 2 - State the standard units for dynamic viscosity in...Ch. 2 - State the equivalent units for poise in terms of...Ch. 2 - Why are the units of poise and centipoise...Ch. 2 - State the mathematical definition for kinematic...Ch. 2 - State the standard units for kinematic viscosity...
Ch. 2 - State the standard units for kinematic viscosity...Ch. 2 - State the equivalent units for stoke in terms of...Ch. 2 - Why are the units of stoke and centistoke...Ch. 2 - Define a Newtonian fluid.Ch. 2 - Define a non-Newtonian fluid.Ch. 2 - Give five examples of Newtonian fluids.Ch. 2 - Give four examples of the types of fluids that are...Ch. 2 - Appendix D iS gives dynamic viscosity for a...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D iS gives dynamic viscosity for a...Ch. 2 - Appendix D iS gives dynamic viscosity for a...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - Appendix D gives dynamic viscosity for a variety...Ch. 2 - If you want to choose a fluid that exhibits a...Ch. 2 - Which type of viscosity measurement method uses...Ch. 2 - In the rotating-drum viscometer, describe how the...Ch. 2 - In the rotating-drum viscometer, describe how the...Ch. 2 - What measurements must be taken to determine...Ch. 2 - Define the term terminal velocity as it applies to...Ch. 2 - What measurements must be taken to determine...Ch. 2 - Describe the basic features of the Saybolt...Ch. 2 - Are the results of the Saybolt viscometer tests...Ch. 2 - Does the Saybolt viscometer produce data related...Ch. 2 - Which type of viscometer is prescribed by SAE for...Ch. 2 - Describe the difference between an SAE 20 oil and...Ch. 2 - What grades of SAE oil are suitable for...Ch. 2 - What grades of SAE oil are suitable for...Ch. 2 - If you were asked to check the viscosity of an oil...Ch. 2 - If you were asked to check the viscosity of an oil...Ch. 2 - Prob. 2.53PPCh. 2 - The viscosity of a lubricating oil is given as 500...Ch. 2 - Using the data from Table 2.5. report the minimum,...Ch. 2 - Convert a dynamic viscosity measurement of 4500 cP...Ch. 2 - Convert a kinematic viscosity measurement of 5.6...Ch. 2 - The viscosity of an oil is given as 80 SUS at...Ch. 2 - Convert a viscosity measurement of 6.5x103 Pa.s...Ch. 2 - An oil container indicates that it has a viscosity...Ch. 2 - In a falling-ball viscometer, a steel ball 1.6 mm...Ch. 2 - A capillary tube viscometer similar to that shown...Ch. 2 - In a falling-ball viscometer, a steel ball with a...Ch. 2 - A capillary type viscometer similar to that shown...Ch. 2 - A fluid has a kinematic viscosity of 15.0 mm2/s at...Ch. 2 - A fluid has a kinematic viscosity of 55.3 mm2/s at...Ch. 2 - A fluid has a kinematic viscosity of 188 mm2/s at...Ch. 2 - A fluid has a kinematic viscosity of 244 mm2/s at...Ch. 2 - A fluid has a kinematic viscosity of 153mm2/s at...Ch. 2 - A fluid has a kinematic viscosity of 205mm2/s at...Ch. 2 - An oil is tested using a Saybolt viscometer and...Ch. 2 - An oil is tested using a Saybolt viscometer and...Ch. 2 - Prob. 2.73PPCh. 2 - Prob. 2.74PPCh. 2 - An oil is tested using a Saybolt viscometer and...Ch. 2 - Prob. 2.76PPCh. 2 - Convert all of the kinematic viscosity data in...Ch. 2 - Use a spreadsheet to display the values of...
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- An airplane that has a cross-sectional diameter D = 4 m of the front portion is to fly at a speed of 600 km/hr in air that has a density of 1.1 kg/m and dynamic viscosity of 1.27 x 10 Pa.s. A small size model of scale ratio (1/17) to be tested in a different fluid that has a dynamic viscosity 5 x 105 Pa .s and a density of 500 kg/m2. It is determined that the parameters that are important for this test are: diameter D, density, viscosity, velocity V, the length of the wings L and the drag force F. What must be the speed (m/s) of the model to Choose... ensure dynamical similitude? What must be the corresponding diameter of the model (cm)? Choose.. What is the number/s of dimensionless groups for this problem? Choose...arrow_forwardI need the answer as soon as possiblearrow_forwardIn falling ball viscometer experiment, the viscometer with a calibration factor K=0.3 is used to measure the viscosity of oil with density p= 0.8 gr/cm3 and the density of Tantalum ball is 16.6 gr/cm3, if the ball is observed to fall 250 mm in time = 103.3 sec. What is the viscosity of the oil (in cp)?arrow_forward
- What methods exist to calculate the viscosity of dense gases and liquids?arrow_forwardQ1. A concentric cylinder viscometer is driven by a falling mass M connected by a cord and pulley to the inner cylmder. Annular gap of width a and height H has been filled with liquid to be tested. The speed of the falling mass is Vim. Develop an algebraic expression for the viscosity of the liquid. Evaluate the viscosity of the liquid using M= 0.1 Kg, R=50mm, H=80 mm, r-25mm, =0.20mm and Vim = 30 + ww XX Cord Puliey,arrow_forwardIn falling ball viscometer experiment, the viscometer with a calibration factor K=0.3 is used to measure the viscosity of oil with density p3D 0.8 gr/cm and the density of Tantalum ball is 16.6 gr/cm, if the ball is observed to fall 250 mm in time 50.3 sec. What is the viscosity of the oil (in cp)?arrow_forward
- Q.1 A simple and accurate viscometer can be made from a length of capillary tubing. If the flow rate and pressure drop are measured, and the tube geometry is known, the viscosity of Newtonian liquid can be computed. A test of a certain liquid in a capillary viscometer gave the following data: Flow rate: 880 mm /s, Tube length: 1 m, ,3, Tube diameter: 0.50 mm, Pressure drop: 1.0 MPа The viscosity of liquid will be (pig =999 kg/m:), assuming the flow to be laminar. A 0.37x10*Ns/m В 3.7x10* Ns/m 1.74x10* Ns/m C 1.74x10* Ns/marrow_forwardThe physical model of a pipe containing water with kinematic viscosity o = 0.804 × 10-6 ™* has been built in the scale of in a laboratory. i. Find the ratio of velocity of water in the main pipe with kinematic viscosity of 8 = 2.79 x 10-4 m? to the model. ii. Discuss the difference in the velocities of the model and main pipe.arrow_forwardA body weighing 77 lb with a flat surface area of 8 ft2 slides down a lubricated inclined plane making a 350 angle with the horizontal. For viscosity of 0.002089 lb-s/ft2 and a body speed of 6 ft/s, determine the lubricant film thickness in inchesarrow_forward
- The kinematic viscosity of a liquid is 0.058 cm^2/s and has a density of 500 kg/m^3. What is the absolute viscosity in poisearrow_forwardThe kinematic viscosity of and specific gravity of a liquid are 3.5 x 10-4 m^2 /s and 0.79, respectively. What is the dynamic viscosity of the liquid in N-s/m^2?arrow_forwardOne end of a capillary tube 10 cm in length and 1 mm in diameter is connected to a water supply which has a pressure of 2 atm. The viscosity coefficient of water is 0.01 poise. How much water does the tube deliver in one second? (1 atm = 106 dynes/cm2)arrow_forward
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