2. For the flow of fluid over a flat membrane of length 10cm,determine the length-average mass transfer coefficient. Therelevant properties of the system are u=0.01cm²/s, D=5 x 106cm²/s, and v = 5.0 cm/s.

Step 1: We use the Schmidt number, Reynolds number, and the Sherwood number correlation to calculate…

Answered: 2. For the flow of fluid over a flat…

Curren'S Math For Meds: Dosages & Sol

11th Edition

ISBN:9781305143531

Author:CURREN

Publisher:CURREN

Chapter20: Iv Medication And Titration Calculations

Section: Chapter Questions

Problem 1.7P

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A particular particle is trying to cross a membrane by simple diffusion from a high concentration of 20mM to a low concentration of 20uM. If a membrane is 15uM in width, and the diffusion coefficient of the particle is 5 uM/sec, what is the influx in uM/sec?
5. When arranged for flow Poiseuille’s law states that flow is 1. inversely proportional to r4. 2. directly proportional to P. 3. inversely proportional to . 4. directly proportional to l. A. 1 only B. 2 only C. 2 and 3 only D. 3 and 4 only
One of the important uses of the Nernst equation is in describing the flow of ions across plasma membranes. Ions move under the influence of two forces: the concentration gradient (given in electrical units by the Nernst equation) and the electrical gradient (given by the membrane voltage). This is summarized by Ohms law: Ix=Gx(VmEx) which describes the movement of ion x across the membrane. I is the current in amperes (A); G is the conductance, a measure of the permeability of x, in Siemens (S), which is I/V;Vm is the membrane voltage; and Ex is the equilibrium potential of ion x. Not only does this equation tell how large the current is, but it also tells what direction the current is flowing. By convention, a negative value of the current represents either a positive ion entering the cell or a negative ion leaving the cell. The opposite is true of a positive value of the current. a. Using the following information, calculate the magnitude of Na [ Na+ ]0=145mM,[ Na+ ]i=15mM,Gna+=1nS,Vm=70mV b. Is Na+ entering or leaving the cell? c. Is Na+ moving with or against the concentration gradient? Is it moving with or against the electrical gradient?
Discuss why the following affect the rate of diffusion: molecular size, temperature, solution density, and the distance that must be traveled

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2. For the flow of fluid over a flat membrane of length 10cm, determine the length-average mass transfer coefficient. The relevant properties of the system are u=0.01cm²/s, D=5 x 106 cm²/s, and v = 5.0 cm/s.