EBK ELEMENTARY PRINCIPLES OF CHEMICAL P
EBK ELEMENTARY PRINCIPLES OF CHEMICAL P
4th Edition
ISBN: 9781119192107
Author: BULLARD
Publisher: JOHN WILEY+SONS,INC.-CONSIGNMENT
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Chapter 2, Problem 2.26P

The Prandtl number, Np,, is a dimensionless group important in heat-transfer calculations. It is defined as Cpfdk. where Cpis the heat capacity of a fluid, n is the fluid viscosity, and k is the thermal conductivity. For a particular fluid, Cp= 0.583 J/(g°C), it = 0.286 W/(m °C), and n = 1936 lbn,/(ft h). Estimate the value of Np, without using a calculator (remember, it is dimensionless), showing your calculations; then determine it with a calculator.

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Q2] The reaction AR + S is irreversible and first order. It is conducted in a PFR with 50 tubes, each with 0.5 in diameter and 1.0 m of height. 200 kg/h of reactant A (MW-80 g/gmol) with 30% inert is introduced at a pressure of 50 atm at 500°C. The output conversion is 80%. Calculate the average residence time.
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Ex. HW. A vertical glass tube, 2cm ID & 5m long in heated uniformly over its length. The water enter at (200-204 C) & 68.9 bar calculated the pressure drop if the flowrate 0.15 Kg/s & the power applied as a heat to the fluid is 100KW using the homogeneous model. Given that enthalpy at inlet temp.=0.87MJ/Kg, enthalpy saturation temp (285C)=1.26 MJ/Kg and μl=0.972*10-4 Ns/m2, μG=2.89*10-5 Ns/m2, UG=2.515*10-2m3/Kg and the change in UG over range of pressure=-4.45*10-4m3/Kg/bar.

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