Skin Thermocouple

Effect of Skin Thermocouple Shield Shape on Measurement Accuracy


THE PROBLEM

Diagram showing the thermocouple in relation to the other components.

Thermocouple visualization

Skin thermocouples are a widely used type of temperature sensor for measurement and control. However, local hot spots sometimes occur in thermocouples during operation. This phenomenon will result in the inaccurate measurement of the temperature. In

addition to the inaccuracies, hot spots can also reduce the lifetime of the heater pipes. For this reason, there are four new skin thermocouple designs, provided by company, which are to be evaluated in order to determine their efficiency.


THE PROJECT

Temperature distribution in tube and pad without a heat shield.

Temperature Distribution in Tube and Pad without a Heat Shield

The objective of this project is to determine the accuracy of the four thermocouples (with and without a heat shield) in measuring the metal tube skin temperature. A series of Computational Fluid Dynamics (CFD) simulations will be performed, and the results will present detailed information regarding the heat transfer between the components and the temperature gradients along the heater.


THE RESULTS

Temperature distribution in tube and pad with a heater shield.

Temperature Distribution in Tube and Pad with a Heater Shield

By analyzing the simulation results, it was concluded that Pad with a Heat-Shield yields lower measurement error than pad without a Heat-Shield does. With the gas velocity increasing, the inaccuracy of measurement is decreasing. The results also provided insights into the potential design improvements which can quickly and easily evaluated using the model.

 

Faculty Collaborator: Dr. Chenn Q. Zhou

Skin thermocouple project flyer.

Download Skin Thermocouple Project Flyer