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Which one of the following is true of flow around a submerged body?
- a)For subsonic, non-viscous flow, the drag is zero
- b)For supersonic flow, the drag coefficient is dependent equally on Mach number and Reynolds number
- c)The lift and drag coefficients of an aerofoil is independent of Reynoldsnumber
- d)For incompressible flow around an aerofoil, the profile drag is the sum offrom drag and skin friction drag.
Correct answer is option 'D'. Can you explain this answer?
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Which one of the following is true of flow around a submerged body?a)F...
Ans. (d) Profile drag comprises two components. Surface friction drag and normal pressure drag (form drag).
This question is part of UPSC exam. View all Mechanical Engineering courses
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Which one of the following is true of flow around a submerged body?a)F...
Incompressible Flow around an Aerofoil: Profile Drag
In the context of flow around a submerged body, the statement "For incompressible flow around an aerofoil, the profile drag is the sum of form drag and skin friction drag" is true. Let's break down the different components involved in this statement to understand it better.
1. Incompressible Flow:
In this scenario, the fluid flow around the submerged body is considered incompressible. This means that the density of the fluid remains constant throughout the flow field. Incompressible flow is typically applicable to low-speed flows where the Mach number is significantly less than 1.
2. Aerofoil:
An aerofoil is a specific shape often used in the design of wings and other lifting surfaces. It is designed to generate aerodynamic forces such as lift and drag. The lift force acts perpendicular to the flow direction and is responsible for the upward force on the aerofoil, while the drag force acts parallel to the flow direction and opposes the motion of the body.
3. Profile Drag:
Profile drag refers to the drag force experienced by an aerofoil due to its shape or profile. This type of drag is primarily caused by two factors: form drag and skin friction drag.
a) Form Drag:
Form drag, also known as pressure drag, is caused by the pressure difference between the upper and lower surfaces of the aerofoil. As the fluid flows over the curved surface of the aerofoil, it creates regions of high and low pressure. The pressure difference results in a net force acting in the opposite direction to the flow, contributing to form drag.
b) Skin Friction Drag:
Skin friction drag is caused by the viscous effects of the fluid flow along the surface of the aerofoil. As the fluid molecules come into contact with the surface, they experience a certain amount of resistance or friction, which leads to the generation of skin friction drag.
The statement suggests that the profile drag experienced by an aerofoil in incompressible flow is the sum of form drag and skin friction drag. This is because both components contribute to the overall drag force acting on the body.
To summarize, in incompressible flow around an aerofoil, the profile drag is the sum of form drag and skin friction drag. This statement is valid and helps in understanding the different factors that contribute to the drag force experienced by a submerged body.
In the context of flow around a submerged body, the statement "For incompressible flow around an aerofoil, the profile drag is the sum of form drag and skin friction drag" is true. Let's break down the different components involved in this statement to understand it better.
1. Incompressible Flow:
In this scenario, the fluid flow around the submerged body is considered incompressible. This means that the density of the fluid remains constant throughout the flow field. Incompressible flow is typically applicable to low-speed flows where the Mach number is significantly less than 1.
2. Aerofoil:
An aerofoil is a specific shape often used in the design of wings and other lifting surfaces. It is designed to generate aerodynamic forces such as lift and drag. The lift force acts perpendicular to the flow direction and is responsible for the upward force on the aerofoil, while the drag force acts parallel to the flow direction and opposes the motion of the body.
3. Profile Drag:
Profile drag refers to the drag force experienced by an aerofoil due to its shape or profile. This type of drag is primarily caused by two factors: form drag and skin friction drag.
a) Form Drag:
Form drag, also known as pressure drag, is caused by the pressure difference between the upper and lower surfaces of the aerofoil. As the fluid flows over the curved surface of the aerofoil, it creates regions of high and low pressure. The pressure difference results in a net force acting in the opposite direction to the flow, contributing to form drag.
b) Skin Friction Drag:
Skin friction drag is caused by the viscous effects of the fluid flow along the surface of the aerofoil. As the fluid molecules come into contact with the surface, they experience a certain amount of resistance or friction, which leads to the generation of skin friction drag.
The statement suggests that the profile drag experienced by an aerofoil in incompressible flow is the sum of form drag and skin friction drag. This is because both components contribute to the overall drag force acting on the body.
To summarize, in incompressible flow around an aerofoil, the profile drag is the sum of form drag and skin friction drag. This statement is valid and helps in understanding the different factors that contribute to the drag force experienced by a submerged body.
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Which one of the following is true of flow around a submerged body?a)For subsonic, non-viscous flow, the drag is zerob)For supersonic flow, the drag coefficient is dependent equally on Mach number and Reynolds numberc)The lift and drag coefficients of an aerofoil is independent of Reynoldsnumberd)For incompressible flow around an aerofoil, the profile drag is the sum offrom drag and skin friction drag.Correct answer is option 'D'. Can you explain this answer?
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Which one of the following is true of flow around a submerged body?a)For subsonic, non-viscous flow, the drag is zerob)For supersonic flow, the drag coefficient is dependent equally on Mach number and Reynolds numberc)The lift and drag coefficients of an aerofoil is independent of Reynoldsnumberd)For incompressible flow around an aerofoil, the profile drag is the sum offrom drag and skin friction drag.Correct answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Which one of the following is true of flow around a submerged body?a)For subsonic, non-viscous flow, the drag is zerob)For supersonic flow, the drag coefficient is dependent equally on Mach number and Reynolds numberc)The lift and drag coefficients of an aerofoil is independent of Reynoldsnumberd)For incompressible flow around an aerofoil, the profile drag is the sum offrom drag and skin friction drag.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following is true of flow around a submerged body?a)For subsonic, non-viscous flow, the drag is zerob)For supersonic flow, the drag coefficient is dependent equally on Mach number and Reynolds numberc)The lift and drag coefficients of an aerofoil is independent of Reynoldsnumberd)For incompressible flow around an aerofoil, the profile drag is the sum offrom drag and skin friction drag.Correct answer is option 'D'. Can you explain this answer?.
Which one of the following is true of flow around a submerged body?a)For subsonic, non-viscous flow, the drag is zerob)For supersonic flow, the drag coefficient is dependent equally on Mach number and Reynolds numberc)The lift and drag coefficients of an aerofoil is independent of Reynoldsnumberd)For incompressible flow around an aerofoil, the profile drag is the sum offrom drag and skin friction drag.Correct answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Which one of the following is true of flow around a submerged body?a)For subsonic, non-viscous flow, the drag is zerob)For supersonic flow, the drag coefficient is dependent equally on Mach number and Reynolds numberc)The lift and drag coefficients of an aerofoil is independent of Reynoldsnumberd)For incompressible flow around an aerofoil, the profile drag is the sum offrom drag and skin friction drag.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following is true of flow around a submerged body?a)For subsonic, non-viscous flow, the drag is zerob)For supersonic flow, the drag coefficient is dependent equally on Mach number and Reynolds numberc)The lift and drag coefficients of an aerofoil is independent of Reynoldsnumberd)For incompressible flow around an aerofoil, the profile drag is the sum offrom drag and skin friction drag.Correct answer is option 'D'. Can you explain this answer?.
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