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A naphthalene sphere of diameter 2 cm is placed in a fresh stream of air flowing at a velocity of 5 m/s and at 45 °C temperature & 1 atm pressure. Density of air is 1.1 kg/m, viscosity of air is 1.92 x 10 Ns/m, diffusivity of naphthalene in air is DAB-0.7 x 10° m/s. Vapor pressure of naphthalene at 45 °C is 115 N/m, Molecular weight of naphthalene is 128 and solid density of naphthalene is 1140 kg/m. The Sherwood number for flow past a sphere is given as Sh=2+0.6Re Sc" 3 Assume that bulk concentration is zero in air. a. Determine the initial mass transfer coefficient and rate or evaporation in kg/s? b. Determine total time required for complete evaporation of naphthalene sphere?

A naphthalene sphere of diameter 2 cm is placed in a fresh stream of air flowing at a velocity of 5 m/s and at 45 °C temperature & 1 atm pressure. Density of air is 1.1 kg/m, viscosity of air is 1.92 x 10 Ns/m, diffusivity of naphthalene in air is DAB-0.7 x 10° m/s. Vapor pressure of naphthalene at 45 °C is 115 N/m, Molecular weight of naphthalene is 128 and solid density of naphthalene is 1140 kg/m. The Sherwood number for flow past a sphere is given as Sh=2+0.6Re Sc" 3 Assume that bulk concentration is zero in air. a. Determine the initial mass transfer coefficient and rate or evaporation in kg/s? b. Determine total time required for complete evaporation of naphthalene sphere?

Introduction to Chemical Engineering Thermodynamics
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
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A naphthalene sphere of diameter 2 cm is placed in a fresh stream of air flowing at a velocity of 5 m/s and at 45 °C temperature & 1 atm pressure. Density of air is 1.1 kg/m³, viscosity of air is 1.92 x 10 Ns/m², diffusivity of naphthalene in air is DAB=0.7 x 10° m²/s. Vapor pressure of naphthalene at 45 °C is 115 N/m, Molecular weight of naphthalene is 128 and solid density of naphthalene is 1140 kg/m³. The Sherwood number for flow past a sphere is given as Sh=2+0.6REº Sc° 3 Assume that bulk concentration is zero in air. Determine the initial mass transfer coefficient and rate or evaporation in kg/s? b. Determine total time required for complete evaporation of naphthalene sphere? a.
Transcribed Image Text:A naphthalene sphere of diameter 2 cm is placed in a fresh stream of air flowing at a velocity of 5 m/s and at 45 °C temperature & 1 atm pressure. Density of air is 1.1 kg/m³, viscosity of air is 1.92 x 10 Ns/m², diffusivity of naphthalene in air is DAB=0.7 x 10° m²/s. Vapor pressure of naphthalene at 45 °C is 115 N/m, Molecular weight of naphthalene is 128 and solid density of naphthalene is 1140 kg/m³. The Sherwood number for flow past a sphere is given as Sh=2+0.6REº Sc° 3 Assume that bulk concentration is zero in air. Determine the initial mass transfer coefficient and rate or evaporation in kg/s? b. Determine total time required for complete evaporation of naphthalene sphere? a.
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