Q2: Use the Orchard equation below to calculate the time for a paint to level out on a wall if the coating has a surface tension of: (a) 35 dynes/cm and (b) 50 dynes/cm 16x yx dt In Where ao initial amplitude, ao striation amplitude at time, t, xaverage coating thickness, y surface tension, 2= wavelength and n = viscosity Coating Subetrate Fig. 28-2 Schematic diagram giving controlling linear dimensions for striation cross section. Use the following values to make the calculations: ao = 0.008 cm, a = 0.00005 cm, x = 0.01 cm (1.e., 4 mils), A = 0.1 cm (i.e., 10 striations /cm), and n = 100 poise.
Q2: Use the Orchard equation below to calculate the time for a paint to level out on a wall if the coating has a surface tension of: (a) 35 dynes/cm and (b) 50 dynes/cm 16x yx dt In Where ao initial amplitude, ao striation amplitude at time, t, xaverage coating thickness, y surface tension, 2= wavelength and n = viscosity Coating Subetrate Fig. 28-2 Schematic diagram giving controlling linear dimensions for striation cross section. Use the following values to make the calculations: ao = 0.008 cm, a = 0.00005 cm, x = 0.01 cm (1.e., 4 mils), A = 0.1 cm (i.e., 10 striations /cm), and n = 100 poise.
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:Q2: Use the Orchard equation below to calculate the time for a paint to level out on a
wall if the coating has a surface tension of: (a) 35 dynes/cm and (b) 50 dynes/cm
16x yx dt
3 14 n
In
a
Where ao = initial amplitude, ao = striation amplitude at time, t, x = average coating
thickness, y= surface tension, 2= wavelength and n = viscosity
Coating
Substrate
Fig. 28-2 Schematic diagram giving controlling linear dimensions for striation
cross section.
Use the following values to make the calculations: a = 0.008 cm, a = 0.00005 cm, x=
0.01 cm (i.e., 4 mils), A = 0.1 cm (i.e., 10 striations /cm), and n = 100 poise.
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