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Old Announcements 

Note: old announcements move here after they drop off the home page.

• FINAL EXAM is 11:30 am, Tuesday, December 11, in regular room. Closed book and notes except you may use two 8.5"x11" sheets with notes on both sides in your own handwriting.
• I plan to be available most of the day Monday Dec 10 in my office for questions. Call the phone number listed above to double-check I'm here before making a special trip.
• Your homework has been recorded and is available for pickup in the wall boxes between rooms 379 and 380 (one door north of my office) in EBU2 - one homework to a slot.
• Solutions for Homework 5 have been posted.
• At 6:30 pm Thurs 11/29, I posted a revised set of notes for the constant flux - full laminar case - see Notes > Lecture notes for Nov 28 class.
  
• See Notes > Lecture Notes page for equations and problem from Nov 28 class.
• Homework 4 solutions have been posted.
• Test 1 results: high 95, median 78.5, mean 76, standard deviation 12, low 54.
  
• Test 1 example solution.
• Zink printer - Interesting use of transient heat conduction to do inkless color printing.
  
• Assignments for all remaining homeworks 4-6 and the final report have been posted on the Assignments page.
  
• No class Monday, November 12 because of Veteran's Day - see academic calendar.
• I added a copy of my lecture notes plus graphical explanation of Leibnitz formula for Monday, November 5 to the Notes, Lecture Notes page - direct link.
• I added a second page to the posted solution of problem 3.7 (pipe insulation) to show the solution procedure algebra - direct link.
  
• Homework 3 solutions have been posted.
• Friday, November 2, I'll be in my office until 1:55 pm. Then I leave for a 2 pm meeting. I should be back not too long after 3 pm. Slide your homework under door, or leave in the wall box and send me email that you did so.
  
• For Problem 5.11, do not consider this as a cylindrical rod. That's a 3D problem. The body can either be considered as a slab whose dimension normal to the page is long (infinite) or, more concretely, as a square rod whose dimension normal to the page is the same dimension as its vertical height with all sides except the two end insulated.
  
• For Problem 5.5, it turns out the finite-difference equation for the inside insulated corner is not equivalent to an internal node. See modified image below on this page.
  
• For Problem 5.11, you can solve this using Comsol only (or other package you are familiar with) - you don't have to solve a finite-difference problem. Report a list of the temperatures at the node locations give in the problem statement (in Comsol, note near bottom of window x,y,T values where you click). I'll give you some extra credit if you've already done that - *or* you can submit a finite-difference solution in place of a Comsol solution.
• In Problem 5.11, the finite-difference nodes are at the line intersections, as in other figures in the chapter: 5 rows of nodes and 11 columns of nodes. The first column of nodes at at 0 C, the 11th column nodes are at 100 C. (earlier said 110 by typo)
• I'm at a meeting all day Tuesday and won't be able to hold office hours. I'll be available most of the day Thursday and Friday.
  
• Thursday, October 25, noon:  See letter from the Senior Vice Chancellor for Academic Affairs and the Chair of the Academic Senate concerning Academic Impact of the Fires. As recommended, I am adding one week to the earlier scheduled dates of homework 3 and the midterm test. Homework 3 will now be due 3 pm, Friday, November 2 at my office. Of course you can turn it in earlier if you wish. The midterm exam will be held Wednesday, November 7 and will cover Chapters 1-5, and will be closed book and notes except you may use one 8.5x11-inch sheet of notes in your own handwriting on both sides.
  
• For those of you who have not had to evacuate your homes, now would be a good time to select a final report topic of interest to you. Your topic should be a specific problem (e.g., cooling of submicron-resolution integrated circuits and not heat transfer in the electronics industry). You should be able to identify and discuss work on that topic in two to a half dozen research papers published within the last ten years. Feel free to email ideas to me for comment.
• Second note on homework problem 5.5: Some of you may wish to use Excel for this problem. See images below on this page for results in both Excel and Matlab. See new link added to Notes page with example of using relaxation method in Excel for 2D steady-state conduction problems. Make sure you turn iteration on in Excel Preferences > Calculation.
  
• Note on homework problem 5.5: See image below on this page. To get this, I followed the example on the Notes page (finite difference 2D SS by matrix inverse). In 5.5, there are 3 major types of nodes: internal, boundary with fixed T, insulated. There three different types of insulated nodes: at flat surface, at outside corner, at inside corner.
• Tuesday, October 23, 3 pm: The chancellor has just announced that classes have been cancelled and campus is closed for the rest of this week. Classes are scheduled to resume this coming Monday, October 29.  We won't be told how this will affect the progress of the quarter until later. The due date for homework 3 and the date for the midterm test will have to be postponed. Since homework 3 will be due sometime soon, you should continue to work on it if you are able. I hope that all of you, your families, and your homes are safe. Check here for updates.
• Date will be revised. See above announcement. Midterm Exam will be held Wednesday, October 31. Material will cover Chapters 1-5 in text.
• See Notes page for finite difference method for 2D transient conduction - examples for both explicit and implicit method.
• See Notes page for finite difference method for 2D steady-state conduction - examples for both matrix inverse and relaxation method.
  
• See Links page for link to explanation of Graphical method for 2D steady-state problems, as discussed in class Oct 10.
  
• See General Info link for grading and homework policy.
  
• Homework 2 assignment is posted, due at start of class Wed Oct 17.
• For problem 3.3, you can simply integrate the equation twice and evaluate the constants using boundary conditions. I now get 70.75 C for highest T in slab.
  
• See image at bottom of this page related to problem 3.7.
• See new Notes > Book Typos link.
• For HW 1 problem 2.8, sketch T profiles you would expect for a case of constant k and for a case in which k increases as T increases.
• Note errors in text on p. 19 in B.C. (iv): it should be -k(dT/dy) = h(T-Tinf) at y=b. So the rule is to order the T's in ( ) in Newton's law of cooling in spatial order they are in positive direction of the coordinate: y=b boundary first then heat transfer fluid with increasing y. For heat transfer at the x=0 boundary, the order is h(Tinf - T) because the order spatially in x is fluid then x=0 boundary.
• For those of you who recently added the course, you should have a computer account automatically added for this course. Use the Account Lookup tool at Academic Computing.
• There was a question asked after class about the Kirchoff transformation for k(T). See these notes on the Notes page.
• We will have a couple homework problems using COMSOL next week and that software is available here only in Linux. All the computers in 239 EBU2 are dual boot Windows-Linux. If you have time before the homework, you can look at the link below for COMSOL showing how to get started.
  
• I've written lecture notes for lecture 1. See the Notes link below, and the Lecture Notes link on that page.
• Trouble accessing the textbook online? See updated instructions on the General Info page.
• Homework 1 assignment has been posted.
• Check here for announcements.