Mechanical Engineering Exam > Mechanical Engineering Questions > Reynolds stress may be defined as thea)Stress...
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Reynolds stress may be defined as the
- a)Stresses (normal and tangential) due to viscosity of the fluid.
- b)Additional normal stresses due to fluctuating velocity components in aturbulent flow.
- c)Additional shear stresses due to fluctuating velocity components in aturbulent flow.
- d)Additional normal and shear stresses due to fluctuating velocity componentsin the flow field.
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Reynolds stress may be defined as thea)Stresses (normal and tangential...
In fluid dynamics, the Reynolds stress is the component of the total stress tensor in a fluid obtained from the averaging operation over the Navier–Stokes equations to account for turbulent fluctuations in fluid momentum.
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Reynolds stress may be defined as thea)Stresses (normal and tangential...
Reynolds stress may be defined as:
Additional shear stresses due to fluctuating velocity components in a turbulent flow.
Explanation:
Reynolds stress is a term used in fluid mechanics to describe the additional shear stresses that occur in a turbulent flow due to fluctuating velocity components. To understand this concept, let's break down the definition and examine each part:
1. Additional shear stresses:
Shear stress is the force per unit area that acts parallel to a surface, causing one layer of fluid to slide past another. In a turbulent flow, the fluid particles move in a chaotic manner, resulting in additional shear stresses beyond what would be expected in a laminar flow. These additional shear stresses are known as Reynolds stresses.
2. Fluctuating velocity components:
In a turbulent flow, the velocity of the fluid particles varies both in magnitude and direction. This variation is referred to as fluctuating velocity components. These fluctuations occur on different spatial and temporal scales, leading to the formation of vortices and eddies in the flow.
3. Turbulent flow:
Turbulent flow is characterized by chaotic and unpredictable fluid motion. It occurs when the flow velocity exceeds a certain threshold, causing the fluid to become highly disturbed and turbulent. Turbulent flows are commonly observed in many practical engineering applications, such as air flow over an aircraft wing or water flow in a river.
4. Reynolds stress:
Reynolds stress is a result of the interactions between the fluctuating velocity components in a turbulent flow. These interactions cause the fluid particles to experience additional shear stresses, which contribute to the overall momentum transfer and mixing in the flow. Reynolds stress can be quantified using mathematical equations that describe the statistical properties of the flow.
In summary, Reynolds stress represents the additional shear stresses that arise from the fluctuating velocity components in a turbulent flow. It plays a significant role in understanding and analyzing turbulent flows, as it affects various aspects of fluid behavior, such as heat transfer, mass transfer, and flow stability.
Additional shear stresses due to fluctuating velocity components in a turbulent flow.
Explanation:
Reynolds stress is a term used in fluid mechanics to describe the additional shear stresses that occur in a turbulent flow due to fluctuating velocity components. To understand this concept, let's break down the definition and examine each part:
1. Additional shear stresses:
Shear stress is the force per unit area that acts parallel to a surface, causing one layer of fluid to slide past another. In a turbulent flow, the fluid particles move in a chaotic manner, resulting in additional shear stresses beyond what would be expected in a laminar flow. These additional shear stresses are known as Reynolds stresses.
2. Fluctuating velocity components:
In a turbulent flow, the velocity of the fluid particles varies both in magnitude and direction. This variation is referred to as fluctuating velocity components. These fluctuations occur on different spatial and temporal scales, leading to the formation of vortices and eddies in the flow.
3. Turbulent flow:
Turbulent flow is characterized by chaotic and unpredictable fluid motion. It occurs when the flow velocity exceeds a certain threshold, causing the fluid to become highly disturbed and turbulent. Turbulent flows are commonly observed in many practical engineering applications, such as air flow over an aircraft wing or water flow in a river.
4. Reynolds stress:
Reynolds stress is a result of the interactions between the fluctuating velocity components in a turbulent flow. These interactions cause the fluid particles to experience additional shear stresses, which contribute to the overall momentum transfer and mixing in the flow. Reynolds stress can be quantified using mathematical equations that describe the statistical properties of the flow.
In summary, Reynolds stress represents the additional shear stresses that arise from the fluctuating velocity components in a turbulent flow. It plays a significant role in understanding and analyzing turbulent flows, as it affects various aspects of fluid behavior, such as heat transfer, mass transfer, and flow stability.
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Reynolds stress may be defined as thea)Stresses (normal and tangential) due to viscosity of the fluid.b)Additional normal stresses due to fluctuating velocity components in aturbulent flow.c)Additional shear stresses due to fluctuating velocity components in aturbulent flow.d)Additional normal and shear stresses due to fluctuating velocity componentsin the flow field.Correct answer is option 'C'. Can you explain this answer?
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Reynolds stress may be defined as thea)Stresses (normal and tangential) due to viscosity of the fluid.b)Additional normal stresses due to fluctuating velocity components in aturbulent flow.c)Additional shear stresses due to fluctuating velocity components in aturbulent flow.d)Additional normal and shear stresses due to fluctuating velocity componentsin the flow field.Correct answer is option 'C'. 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 Reynolds stress may be defined as thea)Stresses (normal and tangential) due to viscosity of the fluid.b)Additional normal stresses due to fluctuating velocity components in aturbulent flow.c)Additional shear stresses due to fluctuating velocity components in aturbulent flow.d)Additional normal and shear stresses due to fluctuating velocity componentsin the flow field.Correct answer is option 'C'. 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 Reynolds stress may be defined as thea)Stresses (normal and tangential) due to viscosity of the fluid.b)Additional normal stresses due to fluctuating velocity components in aturbulent flow.c)Additional shear stresses due to fluctuating velocity components in aturbulent flow.d)Additional normal and shear stresses due to fluctuating velocity componentsin the flow field.Correct answer is option 'C'. Can you explain this answer?.
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