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.
The Nusselt number is proportional to the Prandtl number to the nth power, where n is a positive number less than one.
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To signify.
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avg o.85,but ranges from 0.7 to 0.9 depending on the prandtl number
The Nusselt number is proportional to the Prandtl number to the nth power, where n is a positive number less than one.
Ludwig Prandtl was born on February 4, 1875.
Ludwig Prandtl was born on February 4, 1875.
Ludwig Prandtl died on August 15, 1953 at the age of 78.
Ludwig Prandtl died on August 15, 1953 at the age of 78.
The ratio between the kinematic viscosity and the thermal diffusivity is called the Prandtl Number.
Ludwig Prandtl was born on February 4, 1875 and died on August 15, 1953. Ludwig Prandtl would have been 78 years old at the time of death or 140 years old today.
The flow's Mach angle is constant through a Prandtl-Meyer expansion wave.
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.
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
The centrifuge was first invented in the late 19th century, with the first patent for a centrifugal separator being filed in 1864 by Antonin Prandtl. However, the modern centrifuge as we know it today, with improvements in design and functionality, was developed in the early 20th century.