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The convective heat transfer coefficient in laminar flow over a flat plate
- a)Increases with distance
- b)Increases if a higher viscosity fluid is used
- c)Increases if a denser fluid is used
- d)Decreases with increase in free stream velocity
Correct answer is option 'C'. Can you explain this answer?
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The convective heat transfer coefficient in laminar flow over a flat p...
It mostly increasers if a denser fluid is used.
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The convective heat transfer coefficient in laminar flow over a flat p...
Explanation:
The convective heat transfer coefficient is the measure of the rate at which heat is transferred from a surface to a fluid flowing over it. The coefficient is influenced by various factors, such as the fluid properties, flow conditions, and surface characteristics. Among these, the fluid properties play a significant role in determining the convective heat transfer coefficient.
Density of the fluid:
The density of the fluid is one of the key factors that affect the convective heat transfer coefficient. The density of a fluid is the mass per unit volume. Therefore, a denser fluid has more mass per unit volume, which means that it contains more molecules. As a result, the density of the fluid affects the momentum transfer between the fluid and the surface over which it flows. The momentum transfer is directly proportional to the density of the fluid, and hence, the convective heat transfer coefficient increases with an increase in the density of the fluid.
Other factors affecting the convective heat transfer coefficient:
Apart from the density of the fluid, other factors that influence the convective heat transfer coefficient include:
- Fluid viscosity: The viscosity of the fluid is the measure of its resistance to flow. A higher viscosity fluid has a higher resistance to flow, which results in a thicker boundary layer and reduces the convective heat transfer coefficient.
- Flow conditions: The convective heat transfer coefficient is affected by the flow conditions, such as the velocity and turbulence intensity. In laminar flow, the convective heat transfer coefficient is lower than in turbulent flow.
- Surface characteristics: The convective heat transfer coefficient also depends on the surface characteristics, such as roughness, geometry, and temperature. A rough surface enhances the convective heat transfer coefficient by promoting turbulence and increasing the surface area.
Conclusion:
The convective heat transfer coefficient is influenced by various factors, with the density of the fluid being one of the most significant. A denser fluid has more mass per unit volume, resulting in a higher convective heat transfer coefficient.
The convective heat transfer coefficient is the measure of the rate at which heat is transferred from a surface to a fluid flowing over it. The coefficient is influenced by various factors, such as the fluid properties, flow conditions, and surface characteristics. Among these, the fluid properties play a significant role in determining the convective heat transfer coefficient.
Density of the fluid:
The density of the fluid is one of the key factors that affect the convective heat transfer coefficient. The density of a fluid is the mass per unit volume. Therefore, a denser fluid has more mass per unit volume, which means that it contains more molecules. As a result, the density of the fluid affects the momentum transfer between the fluid and the surface over which it flows. The momentum transfer is directly proportional to the density of the fluid, and hence, the convective heat transfer coefficient increases with an increase in the density of the fluid.
Other factors affecting the convective heat transfer coefficient:
Apart from the density of the fluid, other factors that influence the convective heat transfer coefficient include:
- Fluid viscosity: The viscosity of the fluid is the measure of its resistance to flow. A higher viscosity fluid has a higher resistance to flow, which results in a thicker boundary layer and reduces the convective heat transfer coefficient.
- Flow conditions: The convective heat transfer coefficient is affected by the flow conditions, such as the velocity and turbulence intensity. In laminar flow, the convective heat transfer coefficient is lower than in turbulent flow.
- Surface characteristics: The convective heat transfer coefficient also depends on the surface characteristics, such as roughness, geometry, and temperature. A rough surface enhances the convective heat transfer coefficient by promoting turbulence and increasing the surface area.
Conclusion:
The convective heat transfer coefficient is influenced by various factors, with the density of the fluid being one of the most significant. A denser fluid has more mass per unit volume, resulting in a higher convective heat transfer coefficient.
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The convective heat transfer coefficient in laminar flow over a flat platea)Increases with distanceb)Increases if a higher viscosity fluid is usedc)Increases if a denser fluid is usedd)Decreases with increase in free stream velocityCorrect answer is option 'C'. Can you explain this answer?
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Solutions for The convective heat transfer coefficient in laminar flow over a flat platea)Increases with distanceb)Increases if a higher viscosity fluid is usedc)Increases if a denser fluid is usedd)Decreases with increase in free stream velocityCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Chemical Engineering.
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