A stream of air at 100 kPa pressure and 300 K is flowing on the top surface of a thin flat sheet of solid naphthalene of length 0,2 m with a velocity of 20 m/sec. The other data are: Mass diffusivity of naphthalene vapor in air = 6 x 10-6 m² /sec Kinematic viscosity of air = 1.5 x 10-5 m²/sec Concentration of naphthalene at the air-solid naphthalene interface = 1 x 10-5 kmol/m3 Calculate: (a) the overage mass transfer coefficient over the flat plate (b) the rate of loss of naphthalene from the surface per unit width Note: For heat transfer over a flat plate, convective heat transfer coefficient for laminar flow can be calculated by the equation: Nu = 0.664RE/?Pr/3 %3D You may use analogy between mass and heat transfer.
A stream of air at 100 kPa pressure and 300 K is flowing on the top surface of a thin flat sheet of solid naphthalene of length 0,2 m with a velocity of 20 m/sec. The other data are: Mass diffusivity of naphthalene vapor in air = 6 x 10-6 m² /sec Kinematic viscosity of air = 1.5 x 10-5 m²/sec Concentration of naphthalene at the air-solid naphthalene interface = 1 x 10-5 kmol/m3 Calculate: (a) the overage mass transfer coefficient over the flat plate (b) the rate of loss of naphthalene from the surface per unit width Note: For heat transfer over a flat plate, convective heat transfer coefficient for laminar flow can be calculated by the equation: Nu = 0.664RE/?Pr/3 %3D You may use analogy between mass and heat transfer.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:A stream of air at 100 kPa pressure and 300 K is flowing on the top surface of a thin flat
sheet of solid naphthalene of length 0,2 m with a velocity of 20 m/sec.
The other data are:
Mass diffusivity of naphthalene vapor in air = 6 × 10-6 m² /sec
Kinematic viscosity of air = 1.5 x 1o-5 m² /sec
Concentration of naphthalene at the air-solid naphthalene interface = 1 × 10-5
kmol/m³
Calculate:
(a) the overage mass transfer coefficient over the flat plate
(b) the rate of loss of naphthalene from the surface per unit width
Note: For heat transfer over a flat plate, convective heat transfer coefficient for laminar flow
can be calculated by the equation:
Nu = 0.664RE/²Pr/3
You may use analogy between mass and heat transfer.
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