Fluid Temperature Measurement in Aqueous Solution via Electrochemical Impedance

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

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Performance of Thermal Insulation Reflective Composite Coatings

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.239-242.1771 ◽

2011 ◽

Vol 239-242 ◽

pp. 1771-1774 ◽

Cited By ~ 8

Author(s):

Meng Qiu Jia ◽

Yu Hong Jin

Keyword(s):

Aqueous Solution ◽

Thermal Insulation ◽

Heat Insulation ◽

Electrochemical Impedance ◽

Composite Coatings ◽

Insulation Property ◽

Corrosion Properties ◽

Rutile Titanium Dioxide ◽

Insulation Performance ◽

Good Heat

Reflective topcoat and thermal insulation mid-coat composite coatings system was used in this work. The effect of the content of the hollow glass micro-beads and rutile titanium dioxide on the heat insulation performance and the reflectivity of the coatings were investigated, respectively. The heat insulation performance and the reflectivity of the thermal insulation reflective composite coatings (TIRCCs) were characterized by self-prepared experimental device. The results showed the good heat insulation property, and the insulated temperature reached 12-15°C, and the reflectivity was up to 95%. The anti-corrosion and anti-penetration of the TIRCCs were studied by electrochemical impedance spectroscopy (EIS) technique. The results showed that the resistance of the TIRCCs still be maintained at 108Ω·cm2 after 30 days in the 3.5% aqueous solution of sodium chloride. So The TIRCCs can be used on the surface of the steal structure for decreasing the temperature and enhancing anti-corrosion properties.

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Electrochemical Characteristics of 410 Stainless Steel Produced by MIM Process through EIS Method under SSRT Test

Materials Science Forum ◽

10.4028/www.scientific.net/msf.706-709.2008 ◽

2012 ◽

Vol 706-709 ◽

pp. 2008-2013

Author(s):

Satoshi Sunada ◽

Norio Nunomura ◽

Kazuhiko Majima

Keyword(s):

Aqueous Solution ◽

Stainless Steel ◽

Corrosion Resistance ◽

Electrochemical Impedance Spectroscopy ◽

Electrochemical Impedance ◽

Charge Transfer Resistance ◽

Deionized Water ◽

Electrochemical Characteristics ◽

Transfer Resistance ◽

Impurities And Defects

In this experiment two kinds of 410L stainless steel, i.e., the first one is prepared by the I/M process and the second one is prepared by MIM process were used, and their corrosion behavior under stress in deionized water and the aqueous solution of 0.01kmol·m-3HCl+1.72mol·m-3MgCl2 (pH=2.33) has been investigated by Electrochemical Impedance Spectroscopy (hereafter shortened as EIS) under Slow Strain Rate Tensile (hereafter shortened as SSRT) test. The charge transfer resistance (Rct) of the I/M specimen is larger than that of the MIM specimen irrespective of under stress or non-stress, which means that the I/M specimen has the better corrosion resistance than the MIM specimen in the 0.01kmol·m-3HCl+1.72mol·m-3MgCl2 (pH=2.33) solution. It was also confirmed from the fracture surface observation that hydrogen embrittlement occurred on the MIM specimen in the aqueous solution of 0.01kmol·m-3HCl+1.72mol·m-3MgCl2 (pH=2.33). This result would be confirmed to be due to the existing impurities and defects in the MIM specimen.

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EIS Study of Corrosion Behavior of Hot-Dip Galvanized Steel in 5% NaCl Aqueous Solution

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.335-336.779 ◽

2011 ◽

Vol 335-336 ◽

pp. 779-782

Author(s):

Shi Quan He ◽

Hui Zhong

Keyword(s):

Aqueous Solution ◽

Equivalent Circuit ◽

Corrosion Behavior ◽

Immersion Time ◽

Electrochemical Impedance ◽

Corrosion Behaviour ◽

Impedance Spectrum ◽

Corrosion Products ◽

Galvanized Steel ◽

Electrochemical Impedance Spectrum

Corrosion behaviour of hot-dip galvanized steel in 5% NaCl aqueous solution was studied by electrochemical impedance spectrum (EIS) technique. The results revealed that corrosion behaviour of hot-dip galvanized steel has a great relationship with immersion time. With the increase of immersion time, corrosion products are constantly changing, and the impedance of corrosion products are different. Parameters fitted by equivalent circuit show that the impedance of corrosion products increased at first, then decreased.

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E213 Sensor for Fluid Temperature Measurement by Laser Interferometry : Water Temperature Measurement

The Proceedings of the Thermal Engineering Conference ◽

10.1299/jsmeted.2006.349 ◽

2006 ◽

Vol 2006 (0) ◽

pp. 349-350

Author(s):

Eiji TOMITA ◽

Nobuyuki KAWAHARA ◽

Yasuji TODA

Keyword(s):

Water Temperature ◽

Temperature Measurement ◽

Laser Interferometry ◽

Fluid Temperature

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

Journal of Pressure Vessel Technology ◽

10.1115/1.2929573 ◽

1994 ◽

Vol 116 (2) ◽

pp. 179-187 ◽

Cited By ~ 2

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.

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