Presentation Title

A Study on the Thermal Performance of Cylindrical Heat Pipes

Faculty Mentor

Dr. Maryam Shafahi

Start Date

18-11-2017 1:30 PM

End Date

18-11-2017 1:45 PM

Location

9-247

Session

Engineering/CS 3

Type of Presentation

Oral Talk

Subject Area

engineering_computer_science

Abstract

In this presentation, the experimental results of a water-based heat pipe’s thermal performance are compared to the analytical work of Shafahi et al. by measuring a temperature profile across the length of the 10mm diameter heat pipe using a custom testing apparatus that applies heat at the evaporator section and rejects heat at the condenser section. The overall testing apparatus consists of a chiller unit (NESLAB RTE-211), an assortment of PVC pipe and valves/fittings that serve as the condenser, several clamp-heating elements, a variable voltage transformer that allows for various power inputs and an 8-channel DaqPro data logger with eight K-type thermocouples. The results of the water-based heat pipes thermal performance are calibrated to the analytical models and will be used to characterize the performance of heat pipes containing a nano-particle based fluid.

Summary of research results to be presented

The evaporator, adiabatic and condenser wall temperatures were determined under a heat input of 250, 300, 350, and 400 W using an analytical model. An experiment was also set up to determine the wall temperatures of a heat pipe subject to the same heat inputs. The heat pipe wall temperatures of both the numerical and experimental cases were plotted and it was found that they were in good agreement as both profiles followed the same trend across each section of the the heat pipe with minimal variation in temperature. Furthermore, uncertainty analysis was carried out for calculation of the thermal resistance and it was determined that a low experimental uncertainty existed. It has been shown that experimental set up as well the data collection procedure are valid tools to analyze the thermal performance of a cylindrical heat pipe.

Discrepancies and error between the analytical and experimental profiles may be attributed to heat loss through the evaporator section aluminum sleeve, poor insulation in the adiabatic section and the condenser system inefficiencies due to chiller equipment degradation.

Future tests will be conducted to include the effects of inclination angle. Nanofluids will also be used in future testing as the working fluid in order to observe its effects on heat pipe temperature gradient and thermal resistance.

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Nov 18th, 1:30 PM Nov 18th, 1:45 PM

A Study on the Thermal Performance of Cylindrical Heat Pipes

9-247

In this presentation, the experimental results of a water-based heat pipe’s thermal performance are compared to the analytical work of Shafahi et al. by measuring a temperature profile across the length of the 10mm diameter heat pipe using a custom testing apparatus that applies heat at the evaporator section and rejects heat at the condenser section. The overall testing apparatus consists of a chiller unit (NESLAB RTE-211), an assortment of PVC pipe and valves/fittings that serve as the condenser, several clamp-heating elements, a variable voltage transformer that allows for various power inputs and an 8-channel DaqPro data logger with eight K-type thermocouples. The results of the water-based heat pipes thermal performance are calibrated to the analytical models and will be used to characterize the performance of heat pipes containing a nano-particle based fluid.