International Journal of Thermophysics最新文献

Experimental Study on Cu–Cu–MWCNTs-Hybrid-Nanocomposite Coated Nanostructured Surfaces for Augmenting Pool Boiling Heat Transfer Performance 用于提高池水沸腾传热性能的 Cu-Cu-MWCNTs 混合纳米复合材料涂层纳米结构表面的实验研究

IF 2.5 4区工程技术

International Journal of Thermophysics Pub Date : 2024-11-16 DOI: 10.1007/s10765-024-03458-5

Sanjay Kumar Gupta

{"title":"Experimental Study on Cu–Cu–MWCNTs-Hybrid-Nanocomposite Coated Nanostructured Surfaces for Augmenting Pool Boiling Heat Transfer Performance","authors":"Sanjay Kumar Gupta","doi":"10.1007/s10765-024-03458-5","DOIUrl":"10.1007/s10765-024-03458-5","url":null,"abstract":"<div><p>Inadequate adhesion between the multi-walled carbon nanotube (MWCNT) and the substrate's surface, which will raise the intermediate obstruction, is reported to be a key issue for MWCNT coatings over metallic substrates in the published literature. By utilizing an intermediary layer, the adherence between the metallic substance and the CNT may be strengthened. Emphasis on boiling pools of micro-nano-porous (nanopores on micropores) coverings, particularly MWCNTs on micropores, is currently limited. Two nanocomposites (Cu–Cu) intermediate layers were deposited between the CNTs and a foundation polished metal surface in the current study to increase the bonding between the CNTs and the Cu foundation. Moreover, a three-stage sintering process is used to improve the adhesion between the Cu–Cu–MWCNTs layer and the metallic substrate. The pool boiling of DI water was experimentally investigated with respect to heat transport, bubble behavior, and critical heat flux. The Cu–Cu–MWCNTs-coated substrate achieved the highest heat transfer augmentation and critical heat flux of 374 % and 116 %, respectively, in comparison to a smooth bare surface. With the surface coated with Cu–Cu–MWCNTs, the early signs of nucleate boiling were seen. Highest critical heat flux for the Cu–Cu–MWCNTs-coated substrate was achieved by delayed dryout owing to better rewetting nature of the drier area beneath the created vapor bubble.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"45 12","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142645775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

How Accurate are Your Experimental Data? A More Accessible GUM-Based Methodology for Uncertainty Evaluation 您的实验数据有多准确？基于 GUM 的不确定性评估方法更易于使用

IF 2.5 4区工程技术

International Journal of Thermophysics Pub Date : 2024-11-14 DOI: 10.1007/s10765-024-03446-9

Luca Bernardini, Mark O. McLinden, Xiaoxian Yang, Markus Richter

{"title":"How Accurate are Your Experimental Data? A More Accessible GUM-Based Methodology for Uncertainty Evaluation","authors":"Luca Bernardini, Mark O. McLinden, Xiaoxian Yang, Markus Richter","doi":"10.1007/s10765-024-03446-9","DOIUrl":"10.1007/s10765-024-03446-9","url":null,"abstract":"<div><p>A methodology for evaluating experimental uncertainty is presented. Based on the Guide to the Expression of Uncertainty in Measurement (GUM) in conjunction with a sensitivity analysis, this method readily applies to systems of various degrees of complexity. It consists of three steps: (1) to estimate each uncertainty contribution of the system based on GUM; (2) to determine the sensitivity of the calculated results to variations in each of the input measurands in turn, replacing the partial derivatives of the GUM with a purely numerical approach; and (3) to calculate the overall uncertainty using the error propagation principle. Furthermore, the calculated sensitivity coefficients enable a critical evaluation of the investigated system, allowing the detection of possible targeted improvements. For this reason, the presented method is called “the sensitivity analysis method.” This is applied to three case studies with increasing complexity: a mass calibration procedure, a volume calibration procedure, and a gravimetric densimeter characterized by a multi-parameter nonlinear measuring model. When possible, the results are compared to the GUM uncertainty framework or values available in the literature.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"45 11","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10765-024-03446-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Investigation on Flow Boiling Heat Transfer Characteristics of Water Inside Micro/Nanostructured-Coated Minichannel 微纳包覆小通道内水流动沸腾换热特性的实验研究

IF 2.2 4区工程技术

International Journal of Thermophysics Pub Date : 2023-09-19 DOI: 10.1007/s10765-023-03256-5

Sanjay Kumar Gupta, Rahul Dev Misra

{"title":"Experimental Investigation on Flow Boiling Heat Transfer Characteristics of Water Inside Micro/Nanostructured-Coated Minichannel","authors":"Sanjay Kumar Gupta, Rahul Dev Misra","doi":"10.1007/s10765-023-03256-5","DOIUrl":"10.1007/s10765-023-03256-5","url":null,"abstract":"<div><p>There are several industrial applications where boiling is used, for example boilers, refrigeration systems, nuclear reactor cooling, and microelectronic chip cooling. Experimental research has been carried out to determine the flow boiling heat transfer capabilities of copper-alumina-coated surfaces for application in heat transfer equipment. De-ionized (DI) water is used as the coolant for experimentations in a minichannel with dimensions 10 × 1.5 × 10 mm. Copper surfaces coated with thin copper-alumina nanocomposite films are created using the electrodeposition process. The coated layer created using an electrochemical technique offers strong adhesiveness with the base copper and is therefore anticipated to be suitable for real-world heat transfer appliances as part of the ongoing scientific development in subcooled flow boiling. The electrochemical technique offers easier control over its various parameters, such as current density, duration and electrolyte composition, making it possible to easily achieve a variety of surface characteristics, such as crystallinity, wettability and porosity. as required in the coated surfaces. Additionally, the copper-alumina is a hydrothermally stable oxide material that is well suited for use in boiling heat transfer devices. The boiling (subcooled flow) heat transfer tests are carried out at various mass flows. The improvement in the two-phase heat transfer coefficient (HTC) and critical heat flux (CHF) can reach up to 90 % and 93 %, respectively. The coated surfaces have improved CHF and HTC because of improved wettability, increased surface roughness, and the existence of active nucleate sites in high-density.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"44 10","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"7183608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Overview of Encapsulated Phase Change Materials for Thermal Runaway Control 热失控控制用封装相变材料综述

IF 2.2 4区工程技术

International Journal of Thermophysics Pub Date : 2023-09-19 DOI: 10.1007/s10765-023-03254-7

Alina Adriana Minea

引用次数: 0

New Experimental Data and Modeling for the Densities and Viscosities of the 1,4-Dioxane + 1-Alkanols (C6 to C10) Mixtures 1,4-二氧六烷+ 1-烷醇(C6 ~ C10)混合物密度和粘度的新实验数据和模型

IF 2.2 4区工程技术

International Journal of Thermophysics Pub Date : 2023-09-19 DOI: 10.1007/s10765-023-03255-6

Mohammad Almasi, Hossein Iloukhani, Ariel Hernández

引用次数: 0

The Measurement of Soret and Thermodiffusion Coefficients in Binary and Ternary Liquid Mixtures 二元和三元液体混合物中索氏系数和热扩散系数的测量

IF 2.2 4区工程技术

International Journal of Thermophysics Pub Date : 2023-08-16 DOI: 10.1007/s10765-023-03242-x

W. Köhler, A. Mialdun, M. M. Bou-Ali, V. Shevtsova

{"title":"The Measurement of Soret and Thermodiffusion Coefficients in Binary and Ternary Liquid Mixtures","authors":"W. Köhler, A. Mialdun, M. M. Bou-Ali, V. Shevtsova","doi":"10.1007/s10765-023-03242-x","DOIUrl":"10.1007/s10765-023-03242-x","url":null,"abstract":"<div><p>This review provides an overview of the major, currently used techniques for investigating the Soret effect and measuring thermodiffusion and Soret coefficients, and in most cases also isothermal Fickian diffusion coefficients, in liquid mixtures. The methods are introduced with a focus on binary mixtures. The optical methods comprise optical beam deflection (OBD), optical digital interferometry (ODI) both on the ground and under microgravity conditions in the SODI-IVIDIL experiment for the study of the influence of vibrations onboard the International Space Station, which are all based on Soret cells. The transient holographic grating technique of thermal diffusion-forced Rayleigh scattering (TDFRS) employs light not only for detection of the concentration changes but also for optical volume heating. Thermogravitational columns (TGC) utilize the coupling between convection and thermodiffusion to create concentration changes inside a vertical column with a horizontal temperature gradient. While samples are analyzed after extraction from the column in a classical setup, the recently developed transparent microcolumn allows for interferometric in situ monitoring of the concentration field. The most recent technique relies on the measurement of giant non-equilibrium fluctuations (NEFs) by small-angle light scattering techniques. Research on ternary mixtures, both on the ground and in microgravity, has gained momentum in the context of the DCMIX microgravity project of ESA. Most techniques employed for binaries can be extended to ternaries by introducing a second detection color or by analyzing both refractive index and density of extracted TGC samples. The accuracy is limited by the unavoidable inversion of the so-called contrast factor matrix.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"44 9","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10765-023-03242-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4636641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Estimation of Uncertainty in Wet Bulb Globe Temperature Measurements 湿球温度测量不确定度的估计

IF 2.2 4区工程技术

International Journal of Thermophysics Pub Date : 2023-08-14 DOI: 10.1007/s10765-023-03248-5

Srdjan Jankovic, Branislav Vulevic, Jelena Djokovic

引用次数: 0

A Fast Resonance Frequency Tracking Method for Photoacoustic Cell Based on the Hybrid Single-Frequency Excitation and FFT 基于单频混合激励和FFT的光声电池快速共振频率跟踪方法

IF 2.2 4区工程技术

International Journal of Thermophysics Pub Date : 2023-08-14 DOI: 10.1007/s10765-023-03245-8

Mingyang Chen, Jianwei Wang, Huili Wang, Qianqian Chen, Junguo Li

{"title":"A Fast Resonance Frequency Tracking Method for Photoacoustic Cell Based on the Hybrid Single-Frequency Excitation and FFT","authors":"Mingyang Chen, Jianwei Wang, Huili Wang, Qianqian Chen, Junguo Li","doi":"10.1007/s10765-023-03245-8","DOIUrl":"10.1007/s10765-023-03245-8","url":null,"abstract":"<div><p>The resonance photoacoustic (PA) cell has a resonance enhancement effect and higher resonance frequency. It can significantly improve the signal-to-noise ratio of PA gas detection. However, in resonance PA gas detection, the resonance frequency of the PA cell mainly depends on the gas composition, temperature, and pressure and therefore must be continuously tracked and measured. A fast resonance frequency tracking method for PA cell based on the hybrid single-frequency excitation and the fast fourier transform (FFT) is proposed. The hybrid single-frequency serves as the excitation signal. The FFT is used to collect the spectral data of all frequencies within a certain bandwidth. Under the same conditions, the resonance frequency is measured by sweep frequency and hybrid single-frequency. The experiments show that the resonance frequency tracking time in the 200?Hz bandwidth is 200?s by sweep method. The hybrid single-frequency takes only 1.1?s, which is only 0.55% of the sine sweep tracking time. The accuracy of frequency tracking can reach 1?Hz. In the long-term stability test, the resonance frequency fluctuation is less than?±?1?Hz, and its standard deviation (1 <span>(sigma)</span>) is 0.5681?Hz. This method provides a quick and accurate method for determining the resonance frequency of the resonance PA cell.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"44 9","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4564648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Isomeric Composition and Sample Handling on the Liquid Density of Hydrofluorethers Measured by Vibrating Tube Densimeter at 0.1 MPa 异构体组成和样品处理对0.1 MPa振动管密度计测氢氟醚液体密度的影响

IF 2.2 4区工程技术

International Journal of Thermophysics Pub Date : 2023-08-14 DOI: 10.1007/s10765-023-03247-6

Olga Prokopová, Aleš Blahut, Jan Hajduch, Kateřina Kučnirová, Miroslav Čenský, Ali Aminian, Markus Richter, Václav Vinš

{"title":"Influence of Isomeric Composition and Sample Handling on the Liquid Density of Hydrofluorethers Measured by Vibrating Tube Densimeter at 0.1 MPa","authors":"Olga Prokopová, Aleš Blahut, Jan Hajduch, Kateřina Kučnirová, Miroslav Čenský, Ali Aminian, Markus Richter, Václav Vinš","doi":"10.1007/s10765-023-03247-6","DOIUrl":"10.1007/s10765-023-03247-6","url":null,"abstract":"<div><p>Hydrofluoroethers (HFEs) represent a new family of promising engineering fluids suitable for technical cleaning and cooling of electronic and magnetic devices or as admixtures in refrigerant blends. Here, we report accurate data for the liquid density at 0.1?MPa and temperatures from <span>(273.15,text{K})</span> to <span>(343.15,text{K})</span> for a series of five HFEs, namely, HFE-7000, HFE-7100, HFE-7200, HFE-7300, and HFE-7500. A highly sensitive vibrating tube densimeter with a borosilicate glass U-tube calibrated according to the procedure by Prokopová et al. (J Chem Thermodyn 173:106855, 2022) provided density data with an expanded uncertainty (<span>(k=2)</span>) of <span>(0.13,text{kg}cdot text{m}^{-3})</span>. Influences such as sample degassing, water content, or sample temperature before its dosing into the densimeter are discussed. Thanks to the high sensitivity of the used densimeter, an unexpected shift in the density of different HFE-7100 and HFE-7200 liquid samples was detected. Unlike other HFEs, HFE-7100 and HFE-7200 are mixtures of two hardly separable isomers, which were so far considered having identical thermophysical properties. Utilizing nuclear magnetic resonance spectroscopy, the ratio of <i>n</i>-isomer and <i>iso</i>-isomer was inspected for various liquid samples. In the range of <i>iso</i>-isomer mole fraction from 0.61 to 0.77, the new measurements revealed density differences of more than <span>(5,text{kg}cdot text{m}^{-3})</span> in case of HFE-7100 and of about <span>(3,text{kg}cdot text{m}^{-3})</span> in case of HFE-7200. Consequently, for some applications, the properties of different HFE isomers cannot be considered identical. The Rackett-type correlation for the saturated liquid density was fitted using the new and the literature data.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"44 9","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10765-023-03247-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4857528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interfacial Thermal Transport of Carbon Nanotube on the Substrate 碳纳米管在衬底上的界面热传递

IF 2.2 4区工程技术

International Journal of Thermophysics Pub Date : 2023-08-11 DOI: 10.1007/s10765-023-03244-9

Jiao Chen, Baoyi Hu, Zhaoliang Wang

{"title":"Interfacial Thermal Transport of Carbon Nanotube on the Substrate","authors":"Jiao Chen, Baoyi Hu, Zhaoliang Wang","doi":"10.1007/s10765-023-03244-9","DOIUrl":"10.1007/s10765-023-03244-9","url":null,"abstract":"<div><p>Exploring the thermal transport properties of the interface structure of low-dimensional nanomaterials contributes to a deeper understanding of the interface phonon modes and may provide theoretical support for efficient chip cooling devices. In this manuscript, we have simulated in detail the effects of system temperature, substrate location, and heat flow density on the thermal transport at the SWCNT/Si interface using the Non-equilibrium Molecular Dynamics approach and predicted the interfacial thermal conductance of SWCNT/Si for second, third and fourth order phonon using the Anharmonic Inelastic model. The results show that the low-frequency acoustic branch of SWCNT is suppressed by phonon scattering from the substrate, and the low-frequency phonon branch of SWCNT is boosted by about 1 THz. The anharmonic channels and inelastic phonon scattering significantly affect the interface phonon modes at higher temperatures, and the anharmonic interactions could increase additional thermal transport channels, which result in an increased number of additional phonon peaks. The increase in temperature gradually consumes the phonons incident at the interface in SWCNT, which enhances the anharmonic scattering and weakens the nonlinear characteristics of the material heterostructure, while the weakening of the acoustic branch accompanied by the temperature increase makes the LA phonon branch thermal conduction rate slower and the interfacial thermal conductance gradually stabilizes, which leads to the weakening of the thermal rectification effect.</p></div>","PeriodicalId":598,"journal":{"name":"International Journal of Thermophysics","volume":"44 9","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4448407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0