Fluid Mechanics: Fundamentals and Applications
4th Edition
ISBN: 9781259696534
Author: Yunus A. Cengel Dr., John M. Cimbala
Publisher: McGraw-Hill Education
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 11, Problem 133P
Many drivers turn off their air conditioners and roll down the car widows hopes of saving fuel. But it is claimed that this apparent “free cooling actually increases the fuel consumption of some cars. Investigate this matter and write a report on which practice saves, gasoline under what conditions.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Question: Please explain why your car engine is generally less efficient when its ignition temperature is lower.
*Please be thorough with the answer.
what are the results and discussion in Explaining the operation and importance of the valve system in the internal combustion engines?
explain what a gas power cycle is and why understanding its operation is essential to engineers
Chapter 11 Solutions
Fluid Mechanics: Fundamentals and Applications
Ch. 11 - What is drag? What causes it? Why do we usually...Ch. 11 - Prob. 2CPCh. 11 - Which bicyclist is more likely to go faster: one...Ch. 11 - Prob. 4CPCh. 11 - Define the frontal area of a body subjected to...Ch. 11 - Define the planform area of a body subjected to...Ch. 11 - Prob. 7CPCh. 11 - What is the difference between streamlined and...Ch. 11 - Prob. 9CPCh. 11 - During flow over a given body, the drag force, the...
Ch. 11 - During flow over a given slender body such as a...Ch. 11 - What is terminal velocity? How is it determined?Ch. 11 - What is the difference between skin friction drag...Ch. 11 - What is the effect of surface roughness on the...Ch. 11 - Prob. 15CPCh. 11 - What is flow separation? What causes it? What is...Ch. 11 - Prob. 17CPCh. 11 - Consider laminar flow over a flat plate. How does...Ch. 11 - In general, how does the drag coefficient vary...Ch. 11 - Fairings are attached to the front and back of a...Ch. 11 - Prob. 21PCh. 11 - The resultant of the pressure and wall shear...Ch. 11 - Prob. 23PCh. 11 - Prob. 24PCh. 11 - To reduce the drag coefficient and thus to improve...Ch. 11 - A circular sign has a diameter of 50 cm and is...Ch. 11 - Prob. 28PCh. 11 - Prob. 29PCh. 11 - At highway speeds, about half of the power...Ch. 11 - A submarine can be treated as an ellipsoid with a...Ch. 11 - A 70-kg bicyclist is riding her 1 5-kg bicycle...Ch. 11 - A wind turbine with two or four hollow...Ch. 11 - During steady motion of a vehicle on a level road,...Ch. 11 - Prob. 37EPCh. 11 - A 0.80-m-diameter, 1 .2-rn-high garbage can is...Ch. 11 - An 8-mm-diameter plastic sphere whose density is...Ch. 11 - Prob. 40PCh. 11 - The drag coefficient of a vehicle increases when...Ch. 11 - To reduce the drag coefficient and thus to improve...Ch. 11 - During major windstorms, high vehicles such as RVs...Ch. 11 - What does the friction coefficient represent in...Ch. 11 - What fluid property is responsible for the...Ch. 11 - How is the average friction coefficient determined...Ch. 11 - Prob. 47EPCh. 11 - The local atmospheric pressure in Denver, Colorado...Ch. 11 - Prob. 50PCh. 11 - Prob. 51EPCh. 11 - Air at 25C and 1 atm is flowing over a long flat...Ch. 11 - Prob. 54PCh. 11 - During a winter day, wind at 70 km/h, 5C , and I...Ch. 11 - Prob. 56PCh. 11 - The forming section of a plastics plant puts out a...Ch. 11 - Prob. 58CPCh. 11 - Why is flow separation in flow over cylinders...Ch. 11 - Prob. 60CPCh. 11 - A 5-mm-diameter electrical transmission line is...Ch. 11 - A 1ong 5-cm-diameter steam pipe passes through...Ch. 11 - Consider 0.8-cm-diameter hail that is falling...Ch. 11 - Prob. 64EPCh. 11 - Prob. 65PCh. 11 - Prob. 66PCh. 11 - Prob. 67EPCh. 11 - One of the popular demonstrations in science...Ch. 11 - Prob. 69PCh. 11 - What is stall? What causes an airfoil to stall?...Ch. 11 - Prob. 71CPCh. 11 - Air is flowing past a symmetrical airfoil at zero...Ch. 11 - Both the lift and the drag of an airfoil increase...Ch. 11 - Prob. 74CPCh. 11 - Prob. 75CPCh. 11 - Air is flowing past a symmetrical airfoil at an...Ch. 11 - Prob. 77CPCh. 11 - Prob. 78CPCh. 11 - Prob. 79CPCh. 11 - Prob. 80CPCh. 11 - How do flaps affect the lift and the drag of...Ch. 11 - Prob. 82EPCh. 11 - Consider an aircraft that takes off at 260 km/h...Ch. 11 - Prob. 84PCh. 11 - Prob. 85PCh. 11 - A tennis ball with a mass of 57 and a diameter of...Ch. 11 - A small aircraft has a wing area of 40 m2, a lift...Ch. 11 - Prob. 89PCh. 11 - Consider a light plane that has a total weight of...Ch. 11 - A small airplane has a total mass of 1800 kg and a...Ch. 11 - An airplane has a mass of 48.000 k. a wins area of...Ch. 11 - Prob. 93EPCh. 11 - Prob. 94PCh. 11 - Prob. 95EPCh. 11 - A 2-zn-high, 4-zn-wide rectangular advertisement...Ch. 11 - 11-97 A plastic boat whose bottom surface can be...Ch. 11 - Prob. 99PCh. 11 - Prob. 100EPCh. 11 - A commercial airplane has a total mass of 150.000...Ch. 11 - Prob. 102PCh. 11 - Prob. 103PCh. 11 - Prob. 104PCh. 11 - Prob. 105PCh. 11 - Prob. 107PCh. 11 - Prob. 108PCh. 11 - Prob. 109PCh. 11 - Prob. 110PCh. 11 - Prob. 111PCh. 11 - Prob. 113PCh. 11 - Prob. 115PCh. 11 - Prob. 116PCh. 11 - Prob. 117PCh. 11 - Prob. 118PCh. 11 - Prob. 119PCh. 11 - The region of flow trailing the body where the...Ch. 11 - Prob. 121PCh. 11 - Prob. 122PCh. 11 - Prob. 123PCh. 11 - Prob. 124PCh. 11 - Prob. 125PCh. 11 - Prob. 126PCh. 11 - An airplane has a total mass of 3.000kg and a wing...Ch. 11 - Prob. 128PCh. 11 - Write a report on the history of the reduction of...Ch. 11 - Write a report oil the flips used at the leading...Ch. 11 - Discuss how to calculate drag force a unsteady...Ch. 11 - Large commercial airplanes cruise at high...Ch. 11 - Many drivers turn off their air conditioners and...Ch. 11 - Consider the boundary layer growing on a flat...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- This is a Thermodynamics question. Please explain nicely and write.arrow_forwardWhat are higher-efficiency refrigerant blends that can be used as long-term replacements for R-22 in residential and light-commercial air-conditioning applications?arrow_forwardintake valve intake compression JO BI Tuel injector the temperature of the gas; power exnaust vaive 0010 exhaust The diagrams show the cylinder of a petrol engine in 4 stages. Petrol vapour and air are drawn into the cylinder, The mixture is then squeezed together, and then exploded by a spark. The explosion pushes down the piston. The exhaust gases are then expelled from the cylinder. Use the first law of thermodynamics to analyse the energy changes during the process. At each stage explain what happens to i) the pressure of the gas; ii)arrow_forward
- Thermal efficiency is of key importance in power producing system design. If the engine high and low temperatures are fixed, which cycle has the highest efficiency? Group of answer choices Rankine Otto Carnot Brayton Dieselarrow_forwardPrepare an engine heat balance and distribution of energy table for the following test data gathered from a Diesel engine plant. A diesel engine plant was tested for one hour in the course of a feasibility study. The following data were gathered in the course of the test. a. Duration of the test One hour b. Generated power 600 kW c. Fuel consumption 18.2 kg at 27 degrees Celsius d. Specific Gravity of fuel 0.930 e. Cooling water flow 950 liters/minute f. Inlet & outlet temperature of cooling water 32 degrees & 45 degrees Celsius respectively 25:1 g. Air-fuel ratio h. Ambient temperature 32 degrees Celsius i. Exhaust gas temperature 425 degrees Celsius j. Specific heat of exhaust gas 1.07 kJ/kg K k. Manufacturers data Generator capacity 650 kW Generator efficiency 92 %arrow_forwardA solar plate collector maintains a hot water reservoir at 90 °C. A. Calculate the efficiency of a Carnot engine operating between this temperature and an exhaust temperature of 30 °C. B. Based on the thermodynamic efficiency in (A), how much heat (in J) must be absorbed by the Carnot engine from the hot reservoir per hour in order to provide one kilowatt of power? (Note: 1 watt = 1 J s'4) C. Draw schematically a composite engine consisting of the Carnot engine in (A) which drives a Carnot refrigerator with a working temperature of 10 °C and 30 °C (with a common reservoir at 30 °C). D. For the composite engine in (C), and assuming maximum efficiency, how much heat (in J) must be withdrawn by the refrigerator per hour in order to maintain its temperature at 10 °C? No need to input your answer for letter C.arrow_forward
- The spark-ignition engines run on a mixture of gasoline and air. The amount of mixture the engine can take in depends upon following major factors: (i) Engine displacement. (ii) Maximum revolution per minute (rpm) of engine. (Hi) Carburetor air flow capacity. (iu) Volumetric efficiency of engine. Explain each of the above factor in detail.arrow_forwardUsing thermodynamicsarrow_forwardThe part load efficiency curve for a microturbine running on natural gas is given below: Calculate the consumption of natural gas in m3/s when this microturbine is producing 10, 20, 30, 40, 50 and 60kW. Explain how you calculated your results and present your results in a table; then plot these fuel consumption values as a function of output power. Include your table of results and the plot in your assignment report. What are the key features of this plot of fuel consumption versus output power? [Assume that the energy content of natural gas is 38.7 MJ/m3]arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Refrigeration and Air Conditioning Technology (Mi...Mechanical EngineeringISBN:9781305578296Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill JohnsonPublisher:Cengage Learning
Refrigeration and Air Conditioning Technology (Mi...
Mechanical Engineering
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:Cengage Learning
Heat Transfer – Conduction, Convection and Radiation; Author: NG Science;https://www.youtube.com/watch?v=Me60Ti0E_rY;License: Standard youtube license