Answered: The air freshener shown in the figure…

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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Question

The air freshener shown in the figure below is used to deliver a pleasant vanilla fragrance in a room. The device consists of a rod 1cm in diameter and 5cm in length. The rod is composed of solid mixture containing a volatile aromatic substance that smells like vanilla. A heating element in the center of the rod, 0.5cm in diameter, maintains a constant surface temperature of 40°C to evaporate the aromatic substance. Air at 25°C flows perpendicular to the rod at a velocity of 0.2m/s, and the aroma vapors are immediately diluted to a very low concentration. The density of the gel is 1.1g/cm^3, and the initial loading of the aromatic compound in the solid is 40 mol%. The diffusion coefficient of the volatile substance generating the aroma, which approximates the properties of benzaldehyde, is 0.08cm^2/s in air at 40°C. The vapor pressure of this substance is 428Pa at 40°C

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