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Sun Y, Liu Z, Hao Y, Liu J, Wang Q, Wang H, Li Z, Yin J, Wang H, Jiang W, Liu S, Cui Y, Ding W. Preliminary Investigation of Thermoelectric Electromotive Force Oscillation of NiCr/NiSi Thin Film Thermocouple in Dynamic Calibration. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2308002. [PMID: 38084459 DOI: 10.1002/smll.202308002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 11/14/2023] [Indexed: 06/07/2024]
Abstract
In order to reveal the dynamic response characteristic of thin film thermocouples (TFTCs), the nichrome/nisil (NiCr/NiSi) TFTCs are prepared onto the glass substrate. With short pulse infrared laser system, NiCr/NiSi TFTCs are dynamically calibrated. The thermoelectric electromotive force (TEF) curves of NiCr/NiSi TFTCs are recorded by the memory hicorder system, which could reflect TEF signals with resolution ratio in nanosecond and microvolt, simultaneously. With increasing laser energy from 15.49 to 29.59 mJ, TEF curves display more and more violent oscillation, even negative value. The results show that the bounce of thermal energy happens between two interfaces of TFTCs because the thermal conductivity of glass and air is significantly lower than that of NiSi/NiCr TFTCs. The bounce of thermal energy results in the obvious decrease of nNiCr and nNiSi, as well as oscillation of TEF. For laser energy in 29.59 mJ, the bounce of thermal energy in NiCr film could result in nNiCr < nNiSi. Then, TEF value appears abnormal negative value. Based on the results, the complex thermal energy transport process in TFTCs dynamic calibration is revealed, which results in the oscillation of thermal energy and TEF signal.
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Affiliation(s)
- Yi Sun
- College of Mechanical Engineering, Dalian Jiaotong University, Dalian, 116028, P. R. China
| | - Zhihui Liu
- College of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, P. R. China
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing, 100084, P. R. China
| | - Yuji Hao
- College of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, P. R. China
| | - Jiabei Liu
- College of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, P. R. China
| | - Qizhen Wang
- College of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, P. R. China
| | - Haoyu Wang
- College of Mechanical Engineering, Dalian Jiaotong University, Dalian, 116028, P. R. China
| | - Zhiqiang Li
- College of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, P. R. China
| | - Junwei Yin
- College of Mechanical Engineering, Dalian Jiaotong University, Dalian, 116028, P. R. China
| | - Hualin Wang
- College of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, P. R. China
| | - Weiwei Jiang
- College of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, P. R. China
| | - Shimin Liu
- College of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, P. R. China
| | - Yunxian Cui
- College of Mechanical Engineering, Dalian Jiaotong University, Dalian, 116028, P. R. China
| | - Wanyu Ding
- College of Mechanical Engineering, Dalian Jiaotong University, Dalian, 116028, P. R. China
- College of Materials Science and Engineering, Dalian Jiaotong University, Dalian, 116028, P. R. China
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Aziz S, Ali J, Bhandari KS, Chen W, Li S, Jung DW. Reverse Offset Printed, Biocompatible Temperature Sensor Based on Dark Muscovado. SENSORS (BASEL, SWITZERLAND) 2022; 22:8726. [PMID: 36433321 PMCID: PMC9695939 DOI: 10.3390/s22228726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Revised: 11/08/2022] [Accepted: 11/10/2022] [Indexed: 06/16/2023]
Abstract
A reverse-offset printed temperature sensor based on interdigitated electrodes (IDTs) has been investigated in this study. Silver nanoparticles (AgNPs) were printed on a glass slide in an IDT pattern by reverse-offset printer. The sensing layer consisted of a sucrose film obtained by spin coating the sucrose solution on the IDTs. The temperature sensor demonstrated a negative temperature coefficient (NTC) with an exponential decrease in resistance as the temperature increased. This trend is the characteristic of a NTC thermistor. There is an overall change of ~2800 kΩ for the temperature change of 0 °C to 100 °C. The thermistor is based on a unique temperature sensor using a naturally occurring biocompatible material, i.e., sucrose. The active sensing material of the thermistor, i.e., sucrose used in the experiments was obtained from extract of Muscovado. Our temperature sensor has potential in the biomedical and food industries where environmentally friendly and biocompatible materials are more suitable for sensing accurately and reliably.
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Affiliation(s)
- Shahid Aziz
- Department of Mechanical Engineering, Jeju National University, 102 Jejudaehakro, Jeju-si 63294, Korea
| | - Junaid Ali
- Optoelectronics Research Laboratory (OERL), Department of Physics, COMSATS University Islamabad, Islamabad 45500, Pakistan
| | - Krishna Singh Bhandari
- Department of Mechanical Engineering, Jeju National University, 102 Jejudaehakro, Jeju-si 63294, Korea
| | - Wenning Chen
- Department of Mechanical Engineering, Jeju National University, 102 Jejudaehakro, Jeju-si 63294, Korea
| | - Sijia Li
- Department of Mechanical Engineering, Jeju National University, 102 Jejudaehakro, Jeju-si 63294, Korea
| | - Dong Won Jung
- Department of Mechanical Engineering, Jeju National University, 102 Jejudaehakro, Jeju-si 63294, Korea
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Szczepaniak R. Effect of Surface Topology on the Apparent Thermal Diffusivity of Thin Samples at LFA Measurements. MATERIALS 2022; 15:ma15144755. [PMID: 35888223 PMCID: PMC9322190 DOI: 10.3390/ma15144755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Revised: 06/23/2022] [Accepted: 07/04/2022] [Indexed: 11/21/2022]
Abstract
This paper deals with the problem of the influence of surface topography on the results of thermal diffusivity measurements when determined using the instantaneous surface heat source method, also called the pulse method. The analysis was based on numerical tests carried out using Comsol Multiphysics software. The results of experimental investigations on the actual material structure using an electron microscope, an optical microscope and a profilometer were used to develop a numerical model. The influence of the non-uniformity of the surface of the tested sample on the determined values of half-time of the thermal response of the sample’s rough surface to the impulse forcing on the opposing flat surface was determined by developing the data for simulated measurements. The effect of the position of the response data reading area on the obtained simulation results was also analyzed. The obtained results can be used to improve the accuracy of experimental heat transfer studies performed on thin-film engineering structures depending on the uniformity and parallelism of the material applied to engineering structures. The difference in half-life determination error results for various analyzed models can be as high as 16.7%, depending on the surface from which the responses of the heating impulse are read. With an equivalent model in which 10% of the material volume corresponds to the rough part as a single inclusion, hemisphere, the error in determining thermal diffusivity was equal to 3.8%. An increase in the number of inclusions with smaller weight reduces an error in the determination of thermal diffusivity, as presented in the paper.
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Affiliation(s)
- Robert Szczepaniak
- Faculty of Aviation, Polish Air Force University, Dywizjonu 303 Street No 35, 08-521 Deblin, Poland
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Theoretical and Experimental Investigation on Thermal Characteristics of Railway Double-Row Tapered Roller Bearing. ENERGIES 2022. [DOI: 10.3390/en15124217] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The research on the thermal characteristics of railway double-row tapered roller bearing is of great significance for its structural design and operation monitoring. We established the quasi-static mechanical model of the bearing according to the test conditions, and we obtained the load distribution and kinematic parameters of the bearing. We studied the temperature distribution of railway double-row tapered roller bearing under test conditions through finite element analysis, which was consistent with the test results. We built a bearing testbed to study the effects of different rotating speeds on the temperature distribution of the bearing inner ring, outer ring, and roller. The results show that the speed dramatically affects the bearing inner ring. With the rate increase, the temperature difference between the inner and outer rings decreases gradually, and the temperature at the large end of the roller is the highest.
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