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You want to know what effect convection will have on evaporation if you leave a petri dish of agar uncovered on the bench or in the fume hood (both at 293 K and 1.013 x 10°Pa, so you compare mass ransfer coefficients (kc) (How many times faster/slower?). Water evaporates from the exposed area into he still lab air at a rate of f 2 m/s at a rate of 2.29 x 104 mole/s (WA). 5.73 x 10-6 mole/s (WA). In the fume hood) it evaporates into an air stream

You want to know what effect convection will have on evaporation if you leave a petri dish of agar uncovered on the bench or in the fume hood (both at 293 K and 1.013 x 10°Pa, so you compare mass ransfer coefficients (kc) (How many times faster/slower?). Water evaporates from the exposed area into he still lab air at a rate of f 2 m/s at a rate of 2.29 x 104 mole/s (WA). 5.73 x 10-6 mole/s (WA). In the fume hood) it evaporates into an air stream

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
Problem 1.1P
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--- ### Effect of Convection on Evaporation in Laboratory Settings You want to know what effect convection will have on evaporation if you leave a petri dish of agar uncovered on the bench or in the fume hood (both at 293 K and 1.013 x 10⁵ Pa), so you compare mass transfer coefficients (\( k_c \)) (How many times faster/slower?). Water evaporates from the exposed area into the still lab air at a rate of \( 5.73 \times 10^{-6} \) mole/s (\( W_A \)). In the fume hood, it evaporates into an air stream of 2 m/s at a rate of \( 2.29 \times 10^{-4} \) mole/s (\( W_A \)). **Summary of Key Points:** - **Evaporation Rate in Still Lab Air:** \( 5.73 \times 10^{-6} \) mole/s - **Evaporation Rate in Fume Hood (Air Stream of 2 m/s):** \( 2.29 \times 10^{-4} \) mole/s - **Environmental Conditions:** - Temperature: 293 K - Pressure: \( 1.013 \times 10^5 \) Pa This data suggests that evaporation in the fume hood with an air stream significantly enhances the rate of evaporation compared to still lab air conditions. --- This content can be used as a part of an educational resource to explain the influence of air flow and convection on the rate of evaporation.
Transcribed Image Text:--- ### Effect of Convection on Evaporation in Laboratory Settings You want to know what effect convection will have on evaporation if you leave a petri dish of agar uncovered on the bench or in the fume hood (both at 293 K and 1.013 x 10⁵ Pa), so you compare mass transfer coefficients (\( k_c \)) (How many times faster/slower?). Water evaporates from the exposed area into the still lab air at a rate of \( 5.73 \times 10^{-6} \) mole/s (\( W_A \)). In the fume hood, it evaporates into an air stream of 2 m/s at a rate of \( 2.29 \times 10^{-4} \) mole/s (\( W_A \)). **Summary of Key Points:** - **Evaporation Rate in Still Lab Air:** \( 5.73 \times 10^{-6} \) mole/s - **Evaporation Rate in Fume Hood (Air Stream of 2 m/s):** \( 2.29 \times 10^{-4} \) mole/s - **Environmental Conditions:** - Temperature: 293 K - Pressure: \( 1.013 \times 10^5 \) Pa This data suggests that evaporation in the fume hood with an air stream significantly enhances the rate of evaporation compared to still lab air conditions. --- This content can be used as a part of an educational resource to explain the influence of air flow and convection on the rate of evaporation.
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