Table of Contents
- 1 How does Grashof number differ from Reynolds number?
- 2 How does the Rayleigh number differ from the Grashof number?
- 3 What does Grashof number signifies?
- 4 What is Grashof number formula?
- 5 What does the Rayleigh number represent?
- 6 How do I find my Grashof number?
- 7 What type of chain is formed in 4 bar chain?
- 8 Which of the following dimensionless number plays role in forced convection is played by Grashof number in natural convection?
How does Grashof number differ from Reynolds number?
In forced convection the Reynolds number governs the fluid flow. But, in natural convection the Grashof number is the dimensionless parameter that governs the fluid flow. Using the energy equation and the buoyant force combined with dimensional analysis provides two different ways to derive the Grashof number.
How does the Rayleigh number differ from the Grashof number?
The Rayleigh number is defined as the product of the Grashof number, which describes the relationship between buoyancy and viscosity within a fluid, and the Prandtl number, which describes the relationship between momentum diffusivity and thermal diffusivity.
What does Grashof number signifies?
The Grashof number (Gr) is a dimensionless number in fluid dynamics and heat transfer which approximates the ratio of the buoyancy to viscous force acting on a fluid. It frequently arises in the study of situations involving natural convection and is analogous to the Reynolds number.
What is the role of Grashof number in free convection?
The Grashof number is a dimensionless quantity used in analyzing the velocity distribution in free convection systems. Essentially, the Grashof number is a ratio of buoyant forces to viscous forces. When Gr >> 1, the viscous force is negligible compared to the buoyancy and inertial forces.
What is grashof condition?
The Grashof condition for a four-bar linkage states: If the sum of the shortest and longest link of a planar quadrilateral linkage is less than or equal to the sum of the remaining two links, then the shortest link can rotate fully with respect to a neighboring link.
What is Grashof number formula?
The Grashof number is defined as the ratio of the buoyant to viscous force acting on a fluid in the velocity boundary layer. ν is the kinematic viscosity. For gases β = 1/T where the temperature is in K. For liquids β can be calculated if variation of density with temperature at constant pressure is known.
What does the Rayleigh number represent?
Rayleigh number is a dimensionless number that represents the ratio of buoyancy and thermal diffusivity. Difference between solid surface temperature and free stream temperature can be used as the characteristic temperature difference.
How do I find my Grashof number?
The Gr number is defined for a compressible fluid as:(8.23)Gr=gLC3ρΔρμ2=inertialforce×buoyantforceviscousforce2or(8.24)Gr=gLC3Δρν2ρCompressiblefluidswhere LC is the characteristic length that is frequently chosen as the vertical distance where buoyancy occurs.
What do you mean by Boussinesq approximation What is the physical significance of Grashof number with reference to heat transfer by natural convection?
The Grashof number is the ratio of buoyancy to viscous forces. A value below indicates that the flow is laminar, while a value above indicates that the flow is turbulent. In this case, the Grashof number is around , meaning that the flow is laminar.
When one of the links of a kinematic chain is fixed the chain is known as?
Explanation: Mechanism: When one of the links of a kinematic chain is fixed, the chain is known as a mechanism. It may be used for transmitting or transforming motion.
What type of chain is formed in 4 bar chain?
Explanation: A four-bar linkage, also called a four-bar, is the simplest movable closed chain linkage. It consists of four bodies, called bars or links, connected in a loop by four joints. Generally, the joints are configured so the links move in parallel planes, and the assembly is called a planar four-bar linkage.
Which of the following dimensionless number plays role in forced convection is played by Grashof number in natural convection?
Detailed Solution. The role played by the Reynolds number in forced convection is played by the Grashoff number in natural convection.