1. Mass Transfer (50 points) In designing a fuel cell system for a car, an engineer...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
1. Mass Transfer (50 points) In designing a fuel cell system for a car, an engineer has proposed using an A106 Grade B carbon steel tube to transfer Hydrogen from the generator to the fuel cell. The average operating temperature of this system is expected to be about 150C. The tube itself is to be 1 meter in length and 2 cm in diameter with a thickness of 3 mm. Based on the production from the generator, the concentration of Hydrogen at the inner surface of the tube is estimated to be 2.5x10' kmol H2/m. What is the molar flowrate (in kmol H/s) through the tube wall under steady state conditions? For the purposes of this problem, one can consider the Hydrogen content of the atmosphere negligible. Savannah River National Laboratory has performed a number of experiments on the diffusion of Hydrogen through various grades of carbon steel and has found that for A106 Grade B carbon steel the Diffusion Coefficient is 1.34x1011 m2/s at 150C. Based on the description of the system, what is the mechanism of diffusion for the hydrogen in this problem? Make sure to briefly justify your response. (Hint: Make sure you read the problem carefully and identify the direction of mass transfer so you can correctly determine the correct cross-sectional area to use.) 1. Mass Transfer (50 points) In designing a fuel cell system for a car, an engineer has proposed using an A106 Grade B carbon steel tube to transfer Hydrogen from the generator to the fuel cell. The average operating temperature of this system is expected to be about 150C. The tube itself is to be 1 meter in length and 2 cm in diameter with a thickness of 3 mm. Based on the production from the generator, the concentration of Hydrogen at the inner surface of the tube is estimated to be 2.5x10' kmol H2/m. What is the molar flowrate (in kmol H/s) through the tube wall under steady state conditions? For the purposes of this problem, one can consider the Hydrogen content of the atmosphere negligible. Savannah River National Laboratory has performed a number of experiments on the diffusion of Hydrogen through various grades of carbon steel and has found that for A106 Grade B carbon steel the Diffusion Coefficient is 1.34x1011 m2/s at 150C. Based on the description of the system, what is the mechanism of diffusion for the hydrogen in this problem? Make sure to briefly justify your response. (Hint: Make sure you read the problem carefully and identify the direction of mass transfer so you can correctly determine the correct cross-sectional area to use.)
Expert Answer:
Related Book For
Posted Date:
Students also viewed these chemical engineering questions
-
A legislative committee is considering an appropriations bill to fund a particular preventative health care program. Experts estimate that spending money in this preventative care will save more...
-
a. Example 13-1: Batch Reactor with an Exothermic Reaction Wolfram 1. Adiabatic Case: Use Wolfram to see whether you can find a trajectory that is ready to ignite and whose trajectory looks like a...
-
Managing Scope Changes Case Study Scope changes on a project can occur regardless of how well the project is planned or executed. Scope changes can be the result of something that was omitted during...
-
Brian Caldwell and Adriana Estrada have operated a successful firm for many years, sharing net income and net losses equally. Kris Mays is to be admitted to the partnership on September 1 of the...
-
(a) For the T network in Fig. 19.106, show that the h parameters are: (b) For the same network, show that the transmission parameters are: R.R3 12-R,+R, R +R3 R+R 2R +R R1 Ry R2 D=1+ R2 R2
-
The Joit Company currently manufacturers an electrical component ror its product, a small kitchen appliance. The company's variable unit manufacturing costs of making the electrical component are:...
-
What do you understand by the term monetary policy?
-
Given the following information, calculate the weighted average cost of capital for Digital Processing Inc. Line up the calculations in the order shown in Table. Percent of capital structure:...
-
According to the FDA pregnancy risk drug categories drugs that have a remote risk and have failed to demonstrate risk to the fetus are classified as category
-
Use the ratio test to determine the convergence or divergence of the series: [4 Marks] (-1)*+1 n2 +1 n=1
-
You put $300 in the bank for 5 years at 8%. If interest is added at the end of the year, how much will you have in the bank after one year? Calculate the amount you will have in the bank at the end...
-
For the year ended December 31, 2019, Dent Co. estimated its allowance for uncollectible accounts using the year-end aging of accounts receivable. The following data are available: Allowance for...
-
EXPLAIN AND GIVE EXAMPLES ABOUT 200 WORDS FOR EACH QUESTION 1. 7 marketing mediums: television, radio, magazines, newspapers, digital, out-of-home, and direct marketing. 2. 9 Types of consumer sales...
-
Lamp Light Limited (LLL) manufactures lampshades. It applies variable overhead on the basis of direct labor hours. Information from LLL's standard cost card follows: Variable manufacturing overhead...
-
Evaluate capacitance, charge, voltage and energy in a network containing a series-parallel combination of three capacitors For the circuit shown below, determine the equivalent capacitance of the...
-
. Ebedi plc had the following balances in its statement of financial position as at 30 September 2021 and 2022: Share capital Share premium 10% debentures 2021 165,000 85,000 200,000 2022 195,000...
-
If your school has a subscription to the FASB Codification, go to aaahq.org/ ascLogin.cfm to log in and prepare responses to the following. (a) What is the stock dividend? (b) What is a stock split?...
-
Although they should be considered independently, investing and financing decisions are often considered together. Consider the case of a consumer acquiring a new car. The consumer can purchase a car...
-
The Whitney Bluebirds football team sells a 15 -game season ticket for \(\$ 180\). Assume that the team sells 2,000 season tickets on August 10. The tickets are all used for admission. a. Prepare a...
-
Calculations Beck Company has just billed a customer for \(\$ 1,400\), an amount that includes an eight percent excise tax and a four percent state sales tax. a. What amount of revenue is recorded?...
Study smarter with the SolutionInn App