Table of Contents
- 1 What is characteristic length in Reynolds number?
- 2 Which characteristic length would you use to estimate the Reynolds number in this problem?
- 3 What is the characteristic length of a plate?
- 4 What is characteristic length in Nusselt number?
- 5 What is the characteristic length in Biot number?
- 6 What is the value of characteristics length for cylinder *?
- 7 Which of the following is the value of characteristic length which appears in Biot number for a sphere of radius r?
- 8 What is the exact range of Reynolds number?
- 9 What is the value of Reynolds number?
What is characteristic length in Reynolds number?
Normally it is a length used in determining dynamic similitude. For instance, the ratio between inertia and viscous forces called Reynolds number depends on a characteristic length used to compare experimental data determined in similar situations. In pipes normally it is the diameter of the pipe.
Which characteristic length would you use to estimate the Reynolds number in this problem?
All Answers (6) Hi Aamir Sultan, if you want to calculate the Reynolds number to ensure if your flow is laminar or turbulent, I would take the shortest characteristic length possible.
What is the characteristic length of a plate?
Characteristic Length For a flat plate, L* is the area (of one side) of the plate divided by its perimeter.
How is characteristic length measured?
In computational mechanics, a characteristic length is defined to force localization of a stress softening constitutive equation. The length is associated with an integration point. For 2D analysis, it is calculated by taking the square root of the area.
What is a characteristic scale?
The “characteristic scale” is the scale at which the dominant pattern emerges; i.e., the scale with the maximum spatial variance among locations. Particular phenomena should be addressed at their characteristic scales.
What is characteristic length in Nusselt number?
For flat plates, the characteristic length is usually the distance from the leading edge for a local Nusselt number. Average Nusselt numbers over a distance 0 to L use the L as the characteristic length.
What is the characteristic length in Biot number?
Biot number formula Lc [m] is the characteristic length of a material, h [W/(m² * K)] is the heat transfer coefficient at the material’s surface, k [W/(m * K)] is the thermal conductivity of the material.
What is the value of characteristics length for cylinder *?
What is the value of characteristics length for cylinder? Explanation: π R2 L/2 π R L = R/2. Explanation: For a cylindrical piece, the characteristic linear dimension is, l = volume/surface area = . 00441 m.
How do you find characteristic length in Biot number?
We can compute the characteristic length Lc knowing the volume V and the area A of a surface through which the material is heated up (or cooled down): Lc = V / A . For example for a copper pan of water with characteristic length Lc = 15 cm , the Biot number is Bi = 2.807 .
What is the value of characteristics length for the cylinder *?
Which of the following is the value of characteristic length which appears in Biot number for a sphere of radius r?
Explanation: Biot number = h l/k = 0.48.
What is the exact range of Reynolds number?
For most fish, the Reynolds number is in the range of 1 × 10 5, for a human it is in the range of 1 × 10 6. At higher Reynolds numbers, an object is able to force its way through a flow field even across the streamlines.
What is the value of Reynolds number?
The Reynolds number is the ratio of inertial forces to viscous forces and is a convenient parameter for predicting if a flow condition will be laminar or turbulent.
What is the equation for Reynolds number?
The Reynold’s number can be found from the formula: R = 4511The Reynold’s number is R = 4511. This number is greater than 4000, which means it is in the range that indicates turbulent flow. The flow through the copper pipe going to the tap is turbulent.
What is the SI unit of the Reynolds number?
A similar equation for the Reynolds number in SI units is (5.18)R = 353,678 Q / (νD)