Tools

To study the effect of flow rate on the heat transfer coefficient of a double-pipe heat exchanger under turbulent flow conditions

  1. The components of the experimental set-up will be displayed on the screen. Based on the item displayed as ‘text’ click on the correct component. Hints will be provided for wrong selection. Points will be deducted for the hints provided.

  2. Attempt the Quiz and click NEXT.

  3. The screen will display the experimental set-up. The user should carefully observe the same.

  4. The components of the experimental set-up will be displayed on the screen. They have to be dragged and dropped at the requisite locations to assemble the experimental set-up. Hints will be provided for wrong selection. Points will be deducted for the hints provided.

  5. A new screen will appear prompting to select the dimensions of the heat exchanger. Based on these, the user should calculate the inside heat transfer area, equivalent diameter of annulus, cross-sectional area of inner tube and annulus respectively. Points will be deducted for the hints provided.

  6. Instructions will be displayed on the right hand side for the actions required from the user.

  7. Click on the C.W. valve to open it fully.

  8. Move the slider to the first division.

  9. Click on the Power Button ‘P’ to switch on the pump.

  10. Click on Power Button ‘H’ to switch on the heater.

  11. Click on Set Temperature to select the temperature.

  12. Click on the GREEN Button of the Timer to start and wait for 15 min (900 s) to attain steady state.

  13. Observe the volumetric flowrate displayed by the Rotameter

  14. Enter the Hot and Cold fluid inlet and outlet temperatures along with the volumetric flowrate in the Table displayed on the screen.

  15. The other sets of readings will be displayed automatically.

  16. The table with the fluid properties will be displayed on the screen along with the areas and equivalent diameter calculated earlier. Also, a table with the temperatures and time along with the various entities to be calculated will be displayed.

  17. The various entities namely, v, u, m, Q, LMTD and U have to be calculated. The formulae for the same shall be visible by moving the cursor on the headings of the respective columns.

  18. After entering the calculated value, click on the VERIFY Tab. If the value is correct, proceed for the next calculation, else a message ‘THE VALUE IS WRONG’ will appear.

  19. Click on NEXT for the next screen to appear.

  20. Additional quantities need to be calculated and entered in the table displayed. The formulae for the same shall be visible by moving the cursor on the headings of the respective rows. After each calculation click on the CAL Tab. If the value is correct, proceed for the next calculation, else a message RECALCULATE will appear.

  21. Click on NEXT for the next screen to appear.

  22. Two additional tables for calculating Prandtl number, Reynold’s number along with heat transfer coefficients will be displayed. The formulae for the same will be visible by moving the cursor on the respective headings. After each calculation click on the CAL Tab. If the value is correct, proceed for the next calculation, else a message ‘THE VALUE IS WRONG’ will appear.

  23. A CAUTION or ERROR message may be displayed if the value of Reynold’s number is less than the turbulent flow range.

  24. Click on NEXT for the next screen to appear.

  25. Based on the table showing m, hi_exp and hi_theo, plot a graph by clicking on PLOT GRAPH tab.

  26. Select the data for x and y axis respectively for experimental and theoretical data points.

  27. Based on the plot displayed, the tabs Is Deviation Observed? YES/NO will appear. Click on the appropriate tab.