True fluid temperature reconstruction compensating for conduction error in the temperature measurement of steady fluid flows

2006 ◽  
Vol 77 (3) ◽  
pp. 034903 ◽  
Author(s):  
Chris J. Kobus
Keyword(s):  
Temperature Measurement ◽  
Fluid Flows ◽  
Temperature Reconstruction ◽  
Fluid Temperature ◽  
Conduction Error

scholarly journals Estimating uncertainty of temperature measurements for studies of flow boiling heat transfer in minichannels

2019 ◽  
Vol 213 ◽  
pp. 02059
Author(s):  
Dariusz Michalski ◽  
Kinga Strąk ◽  
Magdalena Piasecka
Keyword(s):  
Heat Transfer ◽  
Temperature Measurement ◽  
Boiling Heat Transfer ◽  
Experimental Error ◽  
Flow Boiling ◽  
Mean Value ◽  
Temperature Measurements ◽  
Fluid Temperature ◽  
Flow Boiling Heat Transfer ◽  
Characteristic Points

This paper presents the method of estimating the uncertainty of temperature measurements conducted using K-type thermocouples in the study of flow boiling heat transfer in minichannels. During heat transfer experiments. the fluid temperature at the inlet and outlet of the minichannel is measured with thermocouples connected to a DaqLab 2005 data acquisition station. The major part of the experimental setup for calibration of temperature measurement included a calibrator of thermocouples. The thermocouples were manufactured by Czaki Thermo-Product. Poland. The temperatures recorded with the thermocouples were compared statistically while measuring the temperature of demineralised water at several characteristic points at liquid phase change or using the reference temperature known from the calibrator. The experimental error of the temperature measurement method was determined according to the principles of statistical analysis. Estimates of the mean value and the experimental standard deviation of the experimental error as well as the confidence interval for a single experimental error and the measurement accuracy were presented. The uncertainty of the difference in temperature was also calculated

Prediction of Fluid Temperatures From Measurements of Outside Wall Temperatures in Pipes

1994 ◽  
Vol 116 (2) ◽  
pp. 179-187 ◽  
Author(s):  
M. Guyette
Keyword(s):  
Temperature Measurement ◽  
Wall Temperature ◽  
Industrial Application ◽  
Thermal Stratification ◽  
Transfer Functions ◽  
Fluid Temperature ◽  
Convolution Integral ◽  
Thermal Transients ◽  
Points Of Interest ◽  
Piping Systems

The monitoring of the fatigue induced by thermal transients in thick-walled structures becomes more and more currently performed, mainly on equipment the failure of which could present severe implications on the environment. The easiest way of performing this monitoring is by use of Green’s functions in a convolution integral of the measured fluid temperatures to assess the stresses at the points of interest. Numerous cases, however, exist where the fluid temperatures are not available and only an outside wall temperature measurement is feasible. This paper describes the development and the industrial application of the so-called “inverse” transfer functions to predict the evolution of the fluid temperature from measurements of the metal temperature either at the outside or in the wall of the considered equipment. Some applications are shown for the particular case of the thermal stratification in piping systems.

Application of the Block Correction Interpolation Technology in the Ultrasonic Temperature Measurement

2011 ◽  
Vol 121-126 ◽  
pp. 1927-1931
Author(s):  
Feng Qin Xie ◽  
Hua Yu Zhang ◽  
Lin Jing Xiao ◽  
Hong Chang Ding
Keyword(s):  
Temperature Measurement ◽  
Theoretical Basis ◽  
Temperature Reconstruction ◽  
Measured Data ◽  
Gas Temperature ◽  
Gas Velocity ◽  
Analysis Software ◽  
Average Speed ◽  
Measured Field ◽  
The One

A new method about the air temperature reconstruction based on the block correction interpolation was put forward. Its theoretical basis is the principles of thermodynamics relations and ultrasonic temperature measurement. The frequency of ultrasonic generator is 40 KHz. Because of the one-to-one relationship between gas temperature and gas velocity, the gas temperature field can be reconstructed through the rebuilding of velocity field. As the distance between the generator and receiver is known, so the average speed on the path can be obtained by detecting the ultrasonic transit-time. After obtaining the average speed of many paths in the field, the correction of the measured data can be done by using the block correction interpolation technology. And through the mathematical analysis software, the reconstruction of the measured field was given.

True-Temperature Reconstruction From Combined Conduction and Transient Thermocouple Temperature Lag Errors in Single-Phase Convection

2013 ◽  
Author(s):  
Chris J. Kobus
Keyword(s):  
Heat Transfer ◽  
Large Body ◽  
Salient Feature ◽  
Temperature Reconstruction ◽  
True Temperature ◽  
Fluid Temperature ◽  
Integral Technique ◽  
Physical Sensors ◽  
Thermocouple Temperature ◽  
Temperature Errors

Much research has been performed on steady-state conduction errors in temperature sensors due to heat transfer to or from vessel walls through which those sensors are mounted. Furthermore, another large body of research exists for temperature errors due to transient lag error due to physical sensors measuring their own temperatures which lag the true fluid temperature that they are immersed in because of convective heat transfer limitations. Not readily available in the archival literature is the reconstruction of the true fluid temperature when both conduction and transient lag errors are present simultaneously. The paper will show how such a condition can indeed be modeled utilizing the integral technique. The salient feature of the integral technique is its simplicity, and this application again validates why the integral technique is still a valuable tool — even in a time of computation heat transfer models — not only as a research tool but as an educational one as well.

scholarly journals Fluid Temperature Measurement by using Ultrasound and Computer Tomography

2005 ◽  
Vol 25 (Supplement1) ◽  
pp. 379-382
Author(s):  
Hideki KOBAYASHI ◽  
Takuya TSUMAKI ◽  
Kenichi P. KOBAYASHI
Keyword(s):  
Temperature Measurement ◽  
Computer Tomography ◽  
Fluid Temperature

Optical Tweezers-Assisted Cross-Correlation Analysis for a Non-intrusive Fluid Temperature Measurement in Microdomains

2012 ◽  
Vol 51 ◽  
pp. 067002
Author(s):  
Chih-Ming Cheng ◽  
Ming-Chih Chang ◽  
Yu-Fen Chang ◽  
Wei-Ting Wang ◽  
Chien-Ting Hsu ◽  
...  
Keyword(s):  
Correlation Analysis ◽  
Temperature Measurement ◽  
Optical Tweezers ◽  
Cross Correlation ◽  
Fluid Temperature ◽  
Cross Correlation Analysis

scholarly journals Fluid Temperature Measurement in Aqueous Solution via Electrochemical Impedance

2019 ◽  
Vol 28 (6) ◽  
pp. 1060-1067
Author(s):  
Alex Baldwin ◽  
Eugene Yoon ◽  
Trevor Hudson ◽  
Ellis Meng
Keyword(s):  
Aqueous Solution ◽  
Temperature Measurement ◽  
Electrochemical Impedance ◽  
Fluid Temperature
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