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Biot Number given Heat Transfer Coefficient and Time Constant Formula

GoBiot Number using Heat Transfer Coefficient Formula

GoBiot Number using Fourier Number Formula

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Biot Number is a dimensionless quantity having the ratio of internal conduction resistance to the surface convection resistance. Check FAQs

Bi = \frac{h \cdot A c \cdot 𝜏}{ρ B \cdot c \cdot V \cdot F o}

Bi - Biot Number?h - Heat Transfer Coefficient?A_c - Surface Area for Convection?𝜏 - Time Constant?ρ_B - Density of Body?c - Specific Heat Capacity?V - Volume of Object?F_o - Fourier Number?

Biot Number given Heat Transfer Coefficient and Time Constant Example

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Here is how the Biot Number given Heat Transfer Coefficient and Time Constant equation looks like with Values.

Here is how the Biot Number given Heat Transfer Coefficient and Time Constant equation looks like with Units.

Here is how the Biot Number given Heat Transfer Coefficient and Time Constant equation looks like.

0.9111 = \frac{10 \cdot 0.0078 \cdot 1937}{15 \cdot 1.5 \cdot 6.541 \cdot 1.134}

0.9111 = \frac{10W/m²*K \cdot 0.0078m² \cdot 1937s}{15kg/m³ \cdot 1.5J/(kg*K) \cdot 6.541m³ \cdot 1.134}

0.9111 = \frac{10 \cdot 0.0078 \cdot 1937}{15 \cdot 1.5 \cdot 6.541 \cdot 1.134}

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Home » Engineering » Chemical Engineering » Heat Transfer » Biot Number given Heat Transfer Coefficient and Time Constant

Biot Number given Heat Transfer Coefficient and Time Constant Solution

Follow our step by step solution on how to calculate Biot Number given Heat Transfer Coefficient and Time Constant?

FIRST Step Consider the formula

Bi = \frac{h \cdot A c \cdot 𝜏}{ρ B \cdot c \cdot V \cdot F o}

Next Step Substitute values of Variables

∴

Bi = \frac{10W/m²*K \cdot 0.0078m² \cdot 1937s}{15kg/m³ \cdot 1.5J/(kg*K) \cdot 6.541m³ \cdot 1.134}

Next Step Prepare to Evaluate

∴

Bi = \frac{10 \cdot 0.0078 \cdot 1937}{15 \cdot 1.5 \cdot 6.541 \cdot 1.134}

Next Step Evaluate

∴

Bi = 0.911086382783427

LAST Step Rounding Answer

∴

Bi = 0.9111

Biot Number given Heat Transfer Coefficient and Time Constant Formula Elements

Variables

Biot Number

Biot Number is a dimensionless quantity having the ratio of internal conduction resistance to the surface convection resistance.

Symbol: Bi

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Heat Transfer Coefficient

The Heat Transfer Coefficient is the heat transferred per unit area per kelvin. Thus area is included in the equation as it represents the area over which the transfer of heat takes place.

Symbol: h

Measurement: Heat Transfer CoefficientUnit: W/m²*K

Note: Value can be positive or negative.

Surface Area for Convection

Surface Area for Convection is defined as the surface area of object which is in the process of heat transfer.

Symbol: A_c

Measurement: AreaUnit: m²

Note: Value can be positive or negative.

Time Constant

Time Constant is defined as the total time taken for a body to attain final temperature from initial temperature.

Symbol: 𝜏

Measurement: TimeUnit: s

Note: Value can be positive or negative.

Density of Body

Density of Body is the physical quantity that expresses the relationship between its mass and its volume.

Symbol: ρ_B

Measurement: DensityUnit: kg/m³

Note: Value should be greater than 0.

Specific Heat Capacity

Specific Heat Capacity is the heat required to raise the temperature of the unit mass of a given substance by a given amount.

Symbol: c

Measurement: Specific Heat CapacityUnit: J/(kg*K)

Note: Value should be greater than 0.

Volume of Object

Volume of Object is the amount of space that a substance or object occupies or that is enclosed within a container.

Symbol: V

Measurement: VolumeUnit: m³

Note: Value should be greater than 0.

Fourier Number

Fourier Number is the ratio of diffusive or conductive transport rate to the quantity storage rate, where the quantity may be either heat or matter.

Symbol: F_o

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Credits

Created by Ayush gupta

University School of Chemical Technology-USCT (GGSIPU), New Delhi

Ayush gupta has created this Formula and 300+ more formulas!

Verified by Prerana Bakli

University of Hawaiʻi at Mānoa (UH Manoa), Hawaii, USA

Prerana Bakli has verified this Formula and 1600+ more formulas!

Other Formulas to find Biot Number

Go Biot Number using Heat Transfer Coefficient

Bi = \frac{h \cdot 𝓁}{k}

Go Biot Number using Fourier Number

Bi = (- \frac{1}{F o}) \cdot \ln (\frac{T - T ∞}{T 0 - T ∞})

Other formulas in Unsteady State Heat Conduction category

Go Fourier Number using Biot Number

F o = (- \frac{1}{Bi}) \cdot \ln (\frac{T - T ∞}{T 0 - T ∞})

Go Initial Internal Energy Content of Body in Reference to Environment Temperature

Q o = ρ B \cdot c \cdot V \cdot (T i - T amb)

How to Evaluate Biot Number given Heat Transfer Coefficient and Time Constant?

Biot Number given Heat Transfer Coefficient and Time Constant evaluator uses Biot Number = (Heat Transfer Coefficient*Surface Area for Convection*Time Constant)/(Density of Body*Specific Heat Capacity*Volume of Object*Fourier Number) to evaluate the Biot Number, The Biot Number given Heat Transfer Coefficient and Time Constant formula is defined as the function of heat transfer coefficient, surface area for convection, time constant, density of body, specific heat capacity, volume of object and fourier number. The exponential part of Lumped Heat capacity equation can also be expressed as the the product of Biot number and fourier number. Biot Number is denoted by Bi symbol.

How to evaluate Biot Number given Heat Transfer Coefficient and Time Constant using this online evaluator? To use this online evaluator for Biot Number given Heat Transfer Coefficient and Time Constant, enter Heat Transfer Coefficient (h), Surface Area for Convection (A_c), Time Constant (𝜏), Density of Body (ρ_B), Specific Heat Capacity (c), Volume of Object (V) & Fourier Number (F_o) and hit the calculate button.

FAQs on Biot Number given Heat Transfer Coefficient and Time Constant

What is the formula to find Biot Number given Heat Transfer Coefficient and Time Constant?

The formula of Biot Number given Heat Transfer Coefficient and Time Constant is expressed as Biot Number = (Heat Transfer Coefficient*Surface Area for Convection*Time Constant)/(Density of Body*Specific Heat Capacity*Volume of Object*Fourier Number). Here is an example- 0.911086 = (10*0.00785*1937)/(15*1.5*6.541*1.134).

How to calculate Biot Number given Heat Transfer Coefficient and Time Constant?

With Heat Transfer Coefficient (h), Surface Area for Convection (A_c), Time Constant (𝜏), Density of Body (ρ_B), Specific Heat Capacity (c), Volume of Object (V) & Fourier Number (F_o) we can find Biot Number given Heat Transfer Coefficient and Time Constant using the formula - Biot Number = (Heat Transfer Coefficient*Surface Area for Convection*Time Constant)/(Density of Body*Specific Heat Capacity*Volume of Object*Fourier Number).

What are the other ways to Calculate Biot Number?

Here are the different ways to Calculate Biot Number-

Biot Number=(Heat Transfer Coefficient*Thickness of Wall)/Thermal Conductivity
Biot Number=(-1/Fourier Number)*ln((Temperature at Any Time T-Temperature of Bulk Fluid)/(Initial Temperature of Object-Temperature of Bulk Fluid))
Biot Number=(Heat Transfer Coefficient*Time Constant)/(Density of Body*Specific Heat Capacity*Characteristic Dimension*Fourier Number)

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: Value
: Unit

Biot Number given Heat Transfer Coefficient and Time Constant Formula

​GoBiot Number using Heat Transfer Coefficient Formula

​GoBiot Number using Fourier Number Formula

Biot Number given Heat Transfer Coefficient and Time Constant Example

Biot Number given Heat Transfer Coefficient and Time Constant Solution

Biot Number given Heat Transfer Coefficient and Time Constant Formula Elements

Credits

Other Formulas to find Biot Number

Other formulas in Unsteady State Heat Conduction category

How to Evaluate Biot Number given Heat Transfer Coefficient and Time Constant?

FAQs on Biot Number given Heat Transfer Coefficient and Time Constant

Variable Name

GoBiot Number using Heat Transfer Coefficient Formula

GoBiot Number using Fourier Number Formula