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Dimensionless Numbers in Heat Transfer

Biot number (Bi) The Biot number, Bi is dimensionless, which is ratio between of the internal and external resistance. where h is the average heat Transfer coeficient. L length dimention, The ratio between the volume and the surface area. k thermal conductivity. Drag coefficient (Cf) The drag coefficient is the ratio of surface shear stress…

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Prandtl Number of Water

Prandtl number of water Pr = μ cp / k Where:  cp : specific heat, (SI units: J/kg·K). μ : dynamic viscosity, (SI units: Pa s = N s/m2).   k : thermal conductivity, (SI units: W/m·K). The specific Heat, dynamic viscosity and the thermal conductivity required for the calculation of Prandtl number of the water were calculated…

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Prandtl Number Of Nitrogen

Prandtl Number Of Nitrogen Table Prandtl number of nitrogen at different pressure @ 1 bar: Property values generated from NIST Database 23: REFPROP Version 7.0 (August 2002). Prandtl Number Of Nitrogen Figure More about Prandtl Number : Prandtl Number Calculator. Pandtl number of Air NITROGEN PRODUCTION FROM AIR Prandtl Number of Oil Prandtl Number Of…

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Prandtl Number of Air

The prandtl number of air is around 0.7 as many other gases at 1 atm.The Prandtl Number is a dimensionless number approaching the proportion of momentum diffusivity and thermal diffusivity.Prandtl number equation is defined as: where:ν is the kinematic viscosity, ν = μ / ρ. μ is dynamic viscosity, (SI units: Pa s = N…

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Different Types of Refrigerants

In the last decade the manufacturer developed different types of refrigerants.  The mechanical vapor compression cycle utilizes the evaporation of a refrigerant to absorb the heat, which will lead to lower the temperature of the surrounding of the evaporator. The first refrigerant used in the word was Ether in 1834 when Perkins proposed a hand…

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NITROGEN PRODUCTION FROM AIR

In this article we will answer how is nitrogen is produced for industrial chemical process? Nitrogen production from air. Nitrogen is produced from dry air as we know by volume the air is composed of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Three types of unit or…