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What is prandtl number and what is its significance?
Prandtl number is dimensionless number, denoted by Npr.Npr = Cp (viscosity)/(thermal conductivity) Cp - specific heat, J per ( Kg Kelvin) viscosity in poise (gm per( cm sec)) thermal conductivity in Watt per (meter kelvin) Prandtl number is important in heat transfer.
Which usually has within it a number of related classes?
Order
What is the factors that effect on number of tubes in shell and tube heat exchanger?
The factors that are affected by number of tubes in shell and tube heat exchanger is the rate of heat transfer and flow rate.
The greater the number of taxa two organisms have in common the more closely related they are?
true
What are the application of seven segment display?
A: Seven segment display can give digital number visually from a source like a computer that has binary outputs the number 64 in digital would be 100000 and also can display alphanumeric which is what humans can readily see So basically transfer information from a machine language to human language
What is the physical significance of nusselt number how is it related with convection and conduction heat transfer hence work out its relationship with the appropriate prameters?
The Nusselt number is the ratio of convective to conductive heat transfer across the boundary layer. Nu=(hL)/k h is heat transfer coefficient L is the characteristic length k is the thermal conductivity
What is prandtl number and what is its significance?
Prandtl number is dimensionless number, denoted by Npr.Npr = Cp (viscosity)/(thermal conductivity) Cp - specific heat, J per ( Kg Kelvin) viscosity in poise (gm per( cm sec)) thermal conductivity in Watt per (meter kelvin) Prandtl number is important in heat transfer.
What is the value of Prandtl No?
avg o.85,but ranges from 0.7 to 0.9 depending on the prandtl number
The ratio of nusselt to biot number is?
unity
What is Dittus-boelter equation in convection.where and when does it apply?
The Dittus-Boelter equation is used to calculate the convective heat transfer coefficient in a fluid flowing inside a tube. It applies to fully developed turbulent flow in the range of Reynolds numbers typically between 3000 and 100,000. The equation is given as Nu = 0.023Re^0.8Pr^0.4, where Nu is the Nusselt number, Re is the Reynolds number, and Pr is the Prandtl number.
Is heat transfer a thermodynamics property?
Not necessarily. Remember: q = hA(dT) h can change depending on these values, however remember the Nusselt equation used to find h. This Nusselt equation varies depending on the Reynolds number, Prandtl number, and sometimes (usually during free convection) the Raleigh number. The Prandtl and Raleigh numbers have terms in them which are functions of the material chosen.
How do you calculat Nusselt number in Fluent?
How can i calculate average nussalte number in corrugated channel by fluent
A dimensionless number which is a ratio of kinematics viscosity to thermal diffusivity is known as?
The Prandtl Number is a dimensionless number approximating the ratio of momentum diffusivity (kinematic viscosity) and thermal diffusivity and can be expressed asPr = v / αThe Prandtl number can alternatively be expressed asPr = μ cp / kThe Prandtl Number is often used in heat transfer and free and forced convection calculations. where:ν : kinematic viscosity, ν = μ / ρ, (SI units : m2/s)α : thermal diffusivity, α = k / (ρcp), (SI units : m2/s)μ : dynamic viscosity, (SI units : Pa s)k: thermal conductivity, (SI units : W/(m K) )cp : specific heat, (SI units : J/(kg K) )ρ : density, (SI units : kg/m3 ).answered by : eng_moom
What has the author Apichart Penkitti written?
Apichart Penkitti has written: 'The influence of artificial cavities on natural convection heat transfer from a horizontal survace' -- subject(s): Heat flux, Natural Convection, Mechanical engineering, Transmission, Nusselt number, Heat, Rayleigh number
A dimensionless number which is a ratio of kinematics viscosity to thermal?
The ratio between the kinematic viscosity and the thermal diffusivity is called the Prandtl Number.
What is the formula for Nu?
The Nusselt number (Nu) is dimensionless and represents the ratio of convective to conductive heat transfer. It is commonly calculated as Nu = hL/k, where h is the convective heat transfer coefficient, L is a characteristic length, and k is the thermal conductivity of the fluid. Additional correlations and equations may be used depending on the specific flow conditions and geometry.
What is the Graetz number?
The Graetz number is {(Diameter/Length)*Reynolds#*Prandtl#}^(1/3) It is used to characterize the thermal development of pipe flow: if the Graetz number is less than 1000, the thermal profile is fully developed.
