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## Credits

Birla Institute of Technology & Science (BITS), Pilani
Ishan Gupta has created this Calculator and 50+ more calculators!
Softusvista Office (Pune), India
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## Reynolds Number for Circular Tubes Solution

STEP 0: Pre-Calculation Summary
Formula Used
reynolds_number = Density*Fluid Velocity*Diameter/Dynamic viscosity
Re = ρ*uf*d/η
This formula uses 4 Variables
Variables Used
Density - The density of a material shows the denseness of that material in a specific given area. This is taken as mass per unit volume of a given object. (Measured in Kilogram per Meter³)
Fluid Velocity - Fluid velocity is the volume of fluid flowing in the given vessel per unit cross sectional area. (Measured in Meter per Second)
Diameter - Diameter is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere. (Measured in Meter)
Dynamic viscosity - Dynamic viscosity is the measurement of the fluid's internal resistance to flow while kinematic viscosity refers to the ratio of dynamic viscosity to density. (Measured in Poise)
STEP 1: Convert Input(s) to Base Unit
Density: 997 Kilogram per Meter³ --> 997 Kilogram per Meter³ No Conversion Required
Fluid Velocity: 1 Meter per Second --> 1 Meter per Second No Conversion Required
Diameter: 10 Meter --> 10 Meter No Conversion Required
Dynamic viscosity: 10 Poise --> 1 Pascal Second (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Re = ρ*uf*d/η --> 997*1*10/1
Evaluating ... ...
Re = 9970
STEP 3: Convert Result to Output's Unit
9970 --> No Conversion Required
9970 <-- Reynolds Number
(Calculation completed in 00.016 seconds)

## < 10+ Heat Transfer Calculators

Heat Exchanger Effectiveness
heat_exchanger_effectiveness = if(Mass of hot fluid*Specific Heat Capacity of Hot Fluid>Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid) { Mass of hot fluid*Specific Heat Capacity of Hot Fluid*(inlet_temperature_hot_fluid-outlet_temperature_hot_fluid)/(Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid*(inlet_temperature_hot_fluid-inlet_temperature_cold_fluid)) } else { Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid*(inlet_temperature_cold_fluid-outlet_temperature_cold_fluid)/(Mass of hot fluid*Specific Heat Capacity of Hot Fluid*(inlet_temperature_hot_fluid-inlet_temperature_cold_fluid)) } Go
Number of Transfer Units in a Heat Exchanger
number_of_transfer_units = if(Mass of hot fluid*Specific Heat Capacity of Hot Fluid>Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid) { overall_heat_transfer_coefficient/(area*Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid) } else { overall_heat_transfer_coefficient/(area*Mass of hot fluid*Specific Heat Capacity of Hot Fluid) } Go
Log Mean Temperature Difference for Counter Current Flow
lmtd = ((Outlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid)-(Inlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid))/ln((Outlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid)/(Inlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid)) Go
Log Mean Temperature Difference for CoCurrent Flow
lmtd = ((Outlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid)-(Inlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid))/ln((Outlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid)/(Inlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid)) Go
Heat Transfer Through Plane Wall or Surface
heat_rate = -Thermal Conductivity*Original cross sectional area*(Outside Temperature-Inside Temperature)/Width Go
Heat Transfer in a Heat Exchanger using cold fluid properties
heat = Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid*(Inlet Temperature of Cold Fluid-Outlet Temperature of Cold Fluid) Go
Heat Transfer in a Heat Exchanger using overall heat transfer coefficient
heat = Overall Heat Transfer Coefficient*Area*(Outside Temperature-Inside Temperature) Go
Critical Radius of Insulation of a Sphere
critical_radius_of_insulation = 2*Thermal Conductivity/External convection heat transfer coefficient Go
Critical Radius of Insulation of a Cylinder
critical_radius_of_insulation = Thermal Conductivity/External convection heat transfer coefficient Go
Emmisive power of a body (Radiation)
power_per_area = (Emissivity*(Temperature)^4)*[Stefan-BoltZ] Go

### Reynolds Number for Circular Tubes Formula

reynolds_number = Density*Fluid Velocity*Diameter/Dynamic viscosity
Re = ρ*uf*d/η

## What is Reynolds number?

The Reynolds number is the ratio of inertial forces to viscous forces. The Reynolds number is a dimensionless number used to categorize the fluids systems in which the effect of viscosity is important in controlling the velocities or the flow pattern of a fluid.

## How to Calculate Reynolds Number for Circular Tubes?

Reynolds Number for Circular Tubes calculator uses reynolds_number = Density*Fluid Velocity*Diameter/Dynamic viscosity to calculate the Reynolds Number, Reynolds Number for Circular Tubes computes the Reynolds no. for fluid flow in circular tubes. It is a measure of how laminar or how turbulent the flow is. Reynolds Number and is denoted by Re symbol.

How to calculate Reynolds Number for Circular Tubes using this online calculator? To use this online calculator for Reynolds Number for Circular Tubes, enter Density (ρ), Fluid Velocity (uf), Diameter (d) and Dynamic viscosity (η) and hit the calculate button. Here is how the Reynolds Number for Circular Tubes calculation can be explained with given input values -> 9970 = 997*1*10/1.

### FAQ

What is Reynolds Number for Circular Tubes?
Reynolds Number for Circular Tubes computes the Reynolds no. for fluid flow in circular tubes. It is a measure of how laminar or how turbulent the flow is and is represented as Re = ρ*uf*d/η or reynolds_number = Density*Fluid Velocity*Diameter/Dynamic viscosity. The density of a material shows the denseness of that material in a specific given area. This is taken as mass per unit volume of a given object, Fluid velocity is the volume of fluid flowing in the given vessel per unit cross sectional area, Diameter is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere and Dynamic viscosity is the measurement of the fluid's internal resistance to flow while kinematic viscosity refers to the ratio of dynamic viscosity to density.
How to calculate Reynolds Number for Circular Tubes?
Reynolds Number for Circular Tubes computes the Reynolds no. for fluid flow in circular tubes. It is a measure of how laminar or how turbulent the flow is is calculated using reynolds_number = Density*Fluid Velocity*Diameter/Dynamic viscosity. To calculate Reynolds Number for Circular Tubes, you need Density (ρ), Fluid Velocity (uf), Diameter (d) and Dynamic viscosity (η). With our tool, you need to enter the respective value for Density, Fluid Velocity, Diameter and Dynamic viscosity and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
How many ways are there to calculate Reynolds Number?
In this formula, Reynolds Number uses Density, Fluid Velocity, Diameter and Dynamic viscosity. We can use 10 other way(s) to calculate the same, which is/are as follows -
• heat_rate = -Thermal Conductivity*Original cross sectional area*(Outside Temperature-Inside Temperature)/Width
• critical_radius_of_insulation = Thermal Conductivity/External convection heat transfer coefficient
• critical_radius_of_insulation = 2*Thermal Conductivity/External convection heat transfer coefficient
• power_per_area = (Emissivity*(Temperature)^4)*[Stefan-BoltZ]
• number_of_transfer_units = if(Mass of hot fluid*Specific Heat Capacity of Hot Fluid>Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid) { overall_heat_transfer_coefficient/(area*Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid) } else { overall_heat_transfer_coefficient/(area*Mass of hot fluid*Specific Heat Capacity of Hot Fluid) }
• lmtd = ((Outlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid)-(Inlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid))/ln((Outlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid)/(Inlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid))
• lmtd = ((Outlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid)-(Inlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid))/ln((Outlet Temperature of Hot Fluid-Inlet Temperature of Cold Fluid)/(Inlet Temperature of Hot Fluid-Outlet Temperature of Cold Fluid))
• heat_exchanger_effectiveness = if(Mass of hot fluid*Specific Heat Capacity of Hot Fluid>Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid) { Mass of hot fluid*Specific Heat Capacity of Hot Fluid*(inlet_temperature_hot_fluid-outlet_temperature_hot_fluid)/(Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid*(inlet_temperature_hot_fluid-inlet_temperature_cold_fluid)) } else { Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid*(inlet_temperature_cold_fluid-outlet_temperature_cold_fluid)/(Mass of hot fluid*Specific Heat Capacity of Hot Fluid*(inlet_temperature_hot_fluid-inlet_temperature_cold_fluid)) }
• heat = Overall Heat Transfer Coefficient*Area*(Outside Temperature-Inside Temperature)
• heat = Mass of Cold Fluid*Specific Heat Capacity of Cold Fluid*(Inlet Temperature of Cold Fluid-Outlet Temperature of Cold Fluid)
Where is the Reynolds Number for Circular Tubes calculator used?
Among many, Reynolds Number for Circular Tubes calculator is widely used in real life applications like {FormulaUses}. Here are few more real life examples -
{FormulaExamplesList} Let Others Know