A variable throttle plate at the inlet to the fan

This preview shows page 28 - 31 out of 77 pages.

We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Introductory Chemistry: A Foundation
The document you are viewing contains questions related to this textbook.
Chapter 10 / Exercise 12
Introductory Chemistry: A Foundation
Zumdahl
Expert Verified
A variable throttle plate at the inlet to the fan allows the velocity of the air through the outlet duct to be varied, and a vane type anemometer within the fan outlet duct allows the air velocity in the duct to be measured over the range 0-7 meters/sec. The inside diameter of the outlet duct is 70mm (matching the length of the heated cylinder). A K-type thermocouple is also located in the air duct (T9), allowing the ambient air temperature to be measured upstream of the heated cylinder. The HT10X unit is used to control the heating of the cylinder. The voltage is controlled by a rotary knob, and the topdigital display can be used to alternatively view the voltage, current, and air velocity by using the selector knob. The temperature at the thermocouples is shown on the bottomdigital display, and the thermocouple selector knob determines which temperature is displayed. Connections for additional accessories and computer data acquisition and control are available on the service unit but are not used in this experiment.
We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Introductory Chemistry: A Foundation
The document you are viewing contains questions related to this textbook.
Chapter 10 / Exercise 12
Introductory Chemistry: A Foundation
Zumdahl
Expert Verified
MEM311: Thermal and Fluid Science Laboratory Experiment 3: Heat Transfer from a Circular Cylinder 29 | P a g eFigure 3. Experimental set-up and schematic view of the duct. Figure 4. Armfield HT10X Unit.
MEM311: Thermal and Fluid Science Laboratory Experiment 3: Heat Transfer from a Circular Cylinder 30 | P a g e D.PROCEDURE***Before operating the equipment, please understand that the heated cylinder will reach temperatures above 500°C. Serious skin burns will result if the equipment is mishandled. Please ask an instructor if you have any questions or concerns. Equipment Set-up Before proceeding with the exercise, ensure that the equipment has been prepared as follows: 1.Locate HT14 Combined Convection and Radiation accessory alongside the HT10X Heat Transfer Service Unit on a suitable bench. 2.Ensure that the horizontal cylinder is located at the top of the vertical metal duct with the T10 thermocouple attached. 3.Connect the thermocouple attached to the horizontal cylinder to socket T10 on the front of the service unit. 4.Connect the thermocouple located in the vertical duct to socket T9 on the service unit. 5.Set the voltage control potentiometer to minimum (counterclockwise) and the selector switch to MANUAL. 6.Connect the power lead from the heated cylinder on the HT14 to the socket marked O/P3 at the rear of the service unit. 7.Ensure that the service unit is connected to an electrical supply. Experimental Procedures You will perform 2 sets of experiments: one for naturalconvection, and another for forcedconvection. For the naturalconvection conditions, you will measure the steady state temperature achieved on the cylinder for 4 different heating voltages (7, 10, 13, and 16 volts). For the forcedconvection cases, you will measure the steady state temperature achieved on the cylinder for 5 different flow velocities (approximately equally spaced between 0 m/s and the maximum attainable by the device), all at a heating voltage of 10 volts.

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture