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Homework #13
*March 16, 2018*

*Posted by biotransport in homework assignments.*

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Here is homework #13 due on March 26th; work problems 5.10, 5.15, 5.19, 5.22

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Homework Assignment #12
*March 14, 2018*

*Posted by biotransport in homework assignments.*

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For HW12 work these problems 5.27 and 5.43. This assignment is due on March 21st.

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Homework Assignment #11
*March 12, 2018*

*Posted by biotransport in homework assignments.*

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Here is HW #11 due on March 19th:

1. A drug has an equilibrium solubility in water of 0.0025 g cm^-3. The diffusivity of the drug in water is 0.9 x 10^-5 cm2/sec. The drug is made into particles that have a radius of 0.1 cm and these particles have a density of 1.27 g/cm^3. These particles are all of the same size and are gently mixed in water in a stirred vessel. Estimate the length of time in hours (hrs) that it will take for these drug particles to completely dissolve. You can assume that the vessel volume is so large that the concentration of the drug in the bulk liquid is very small in comparison to the drug solubility. Also since the particles are all the same size, the time to dissolve is the same for all the particles.

2. How long would it take a small bubble of air (MW=29) to dissolve in water? Assume the initial diameter of the bubble is 2mm and that the ratio of the particle or air bubble density and the saturation concentration of air in water is 50. Also, the diffusivity of air at these conditions is 2 x10^-5 cm^2/sec.

3. In chapter 5, also work problems 13, 29.

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Homework Assignment #10
*February 26, 2018*

*Posted by biotransport in homework assignments.*

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Here is homework assignment #10 due on March 14th, in chapter 5 work problems 1, 14, 35, 36

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Chapter 5 Lecture Slides
*February 23, 2018*

*Posted by biotransport in lectures.*

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Some You Tubes of diffusion: tea bag https://www.youtube.com/watch?v=ZLRuvarmJZg ; skittles https://www.youtube.com/watch?v=2y3imqlWR_A and convection and diffusion https:// www.youtube.com/watch?v=WEDUtS0IMws Here are some additional notes on some stuff we will be talking about from Chapter 5; notes about film theory, filmtheory

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Answers to 1st Exam
*February 23, 2018*

*Posted by biotransport in miscellaneous information.*

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Here are the answers for the 1st exam. *Problem 1*: 60.55 cP , *Problem 2*: 24.3 mmHg , *Problem 3*: LP=4.03 x 10^-7 cm/Pa/sec, q=7.75 ml/cm2hr , *Problem 4*: 73575 g/mol

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Homework Assignment #9
*February 19, 2018*

*Posted by biotransport in homework assignments.*

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Here is the link to HW#9 due on March 12th, hw9

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Matlab 1st Order ODE Example
*February 16, 2018*

*Posted by biotransport in miscellaneous information.*

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Here is an example of how to solve a first order ordinary differential equation using Matlab. The function in this case is that dy/dx = – 3 y with the boundary condition that when x = 0 then y(0) = 4. This solution is applicable to solving problem 4.7 in HW8, where in this case, think of the ODE as dZ/dt = – A V[Z(t)] and the initial condition is that when t = 0 then Z(0) = 1.3 m. The term A is just a constant that includes all the other variables, make sure your units are all compatible. You would solve this over the time interval from 0 (tstart = 0) to say 100 minutes (tend = 100) and note when Z = 1m which means the bag is empty. Here is the program ODE

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An Extra Bernoulli Example
*February 16, 2018*

*Posted by biotransport in lectures.*

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Homework Assignment #8 – Updated
*February 12, 2018*

*Posted by biotransport in homework assignments.*

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Here is Homework #8 NOW due on February 28th and under my door by March 2nd; work problems 4.7, 4.32, 4.44, 4.53, 4.89, and 4.92.

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Homework Assignment #7
*February 7, 2018*

*Posted by biotransport in homework assignments.*

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For homework #7 work problems 4.27 and 4.47. These problems are due on February 23rd.

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On Pitot Tubes
*February 12, 2018*

*Posted by biotransport in miscellaneous information.*

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At left are some photos of pitot tubes on the side of a 747 parked at Detroit Metro and one that a student’s friend, an aircraft mechanic, provided. Here’s a news story from ABC about the crash with some animation http://abcnews.go.com/Blotter/air-france-flight-447-crash-didnt-happen-expert/story?id=16717404 and an article from Scientific American http://www.scientificamerican.com/article.cfm?id=what-is-a-pitot-tube .