Article
Thermodynamics
Hong Yu, Hengyun Zhang, Jinghe Shi, Shunbo Liu, Zhaozang Yi, Shen Xu, Xinwei Wang
Summary: In this work, a new method of quasi-steady state heat guarding measurement is proposed to determine the thermophysical parameters of cylindrical batteries. By using finite element analysis and measurement of a standard ANSI 304 stainless steel sample, the effectiveness of the heat guarding method is evaluated. The experimental results show that this method can accurately determine the axial thermal conductivity and specific heat of cylindrical batteries, which are crucial for thermal design and management of these batteries.
APPLIED THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Bohan Shao, Caterina Valeo, Phalguni Mukhopadhyaya, Jianxun He
Summary: The study found that moisture content has a significant impact on the thermal conductivity of green roof substrates at different temperatures, with thermal conductivity increasing linearly with increased moisture content. By constructing two equal-sized test cells, comparisons were made between bare roofs, varying thicknesses of green roof substrates, and vegetation configurations, revealing a 75% reduction in interior temperature amplitude for the green roof with a substrate thickness of 150 mm compared to the bare roof.
Article
Materials Science, Paper & Wood
Hamiyet Sahin Kol, Kubra Gunduz Vaydogan
Summary: The study investigated the temperature dependence and relative humidity dependence of the thermal conductivity of heat-treated pine and beech wood commonly used in building construction. The thermal conductivity of the heat-treated wood decreased with increasing temperature and relative humidity. However, the thermal conductivity became more stable after heat treatment under relative humidity changes. The temperature dependence of the heat-treated wood was not affected by the relative humidity changes. Therefore, heat-treated wood with low humidity variation can be preferred for building construction.
Article
Pharmacology & Pharmacy
Carter Blocka, Mojtaba Nabipoor Hassankiadeh, Lifeng Zhang, Oon-Doo Baik
Summary: This study used a transient line heat source method to determine the thermal conductivity and volumetric specific heat capacity of common pharmaceutical components and binary mixtures. A regression model was evaluated and relationships were established between thermal properties and moisture content for pharmaceutical ingredients.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2023)
Article
Soil Science
Saeedeh Khaledi, Masoomeh Delbari, Hadi Galavi, Hossein Bagheri, Mohammad Mahdi Chari
Summary: This study investigated and modeled the effects of biochar particle size, biochar rate, and soil moisture content on the thermal properties of a sandy loam soil. The results showed that a higher biochar application rate significantly altered soil physical and chemical properties, while biochar particle sizes had a remarkable effect on soil thermal properties. Soil moisture had a more robust effect on thermal properties than biochar amendment. Mathematical models were able to estimate thermal conductivity, heat capacity, and thermal diffusivity accurately.
SOIL & TILLAGE RESEARCH
(2023)
Article
Energy & Fuels
Arjun Sivaprasad, Prasenjit Basu
Summary: This paper presents the development of a new soil thermal conductivity measurement device that can simulate soil under different stress conditions and estimate both transient and steady-state thermal conductivity. The results from tests on seven different soils show that the transient-state thermal conductivity increases beyond a certain threshold value of temperature increment rate.
Article
Construction & Building Technology
Benat Arregi, Roberto Garay-Martinez, Juan Carlos Ramos
Summary: There is a growing interest in characterizing the thermal performance of building envelopes under realistic weather and indoor conditions. This study analyzes data from a full-scale test of four uninsulated concrete panels using different models. The results show that the distributed capacitance model provides consistent estimates for thermal capacity, while steady-state and lumped capacitance models suit different temperature differences and stability conditions. This research can provide guidance for using dynamic methods with physical interpretation and serve as a basis for further research on more complex walls and design scenarios involving thermal insulation.
ENERGY AND BUILDINGS
(2023)
Article
Chemistry, Multidisciplinary
Shuo Qiao, Deyu Li, Lin Yang
Summary: In this study, efficient heat flow modulation in a single material was achieved without a phase transition, using a simple and material-independent strategy of kinked nanostructure patterning at near-ambient temperature. The modulation was achieved by controlling the kink arm length and angle of Si nanoribbons, resulting from the competing roles of phonon backscattering and open view channels on heat transport. This study opens up new opportunities for efficient heat flow manipulation through nanostructure patterning.
Review
Thermodynamics
M. Y. Wong, C. Y. Tso, T. C. Ho, H. H. Lee
Summary: This review summarizes theoretical and experimental studies of thermal diodes introduced in recent years, discussing their classification, thermal rectification mechanisms, and various application potentials.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Construction & Building Technology
Brahim Mazhoud, Florence Collet, Sylvie Pretot, Christophe Lanos
Summary: This study experimentally investigates the effects of clay stabilization and hemp content on hygric and thermal performances of composites. It reveals that the designed composites exhibit excellent moisture buffering properties and thermal conductivity suitable for distributed insulation. The linear relationships between hemp content, binder types, density, and water content are identified in this study.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Thermodynamics
Ismael Sanchez-Calderon, Beatriz Merillas, Victoria Bernardo, Miguel Angel Rodriguez-Perez
Summary: Developing advanced, highly insulating materials for reducing heat losses in buildings is crucial. A new methodology for measuring the thermal conductivity of small prototypes of thermal insulating materials has been developed and validated in this study. The results demonstrate the accuracy of the self-developed method in determining the thermal conductivity of samples with small dimensions using a steady-state condition.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Waqar Ahmed, Z. Z. Chowdhury, S. N. Kazi, Mohd Rafie Bin Johan, Ali H. Abdelrazek, H. Fayaz, Irfan Anjum Badruddin, M. A. Mujtaba, Manzoore Elahi M. Soudagar, Naveed Akram, Shahid Mehmood, Muhammad Shakeel Ahmad, Sarfaraz Kamangar, T. M. Yunus Khan
Summary: This study investigates the thermal and hydrodynamic characteristics of different concentrations of ZnO-DW nanofluids in a closed single-tube circular heat exchanger through experimental and ANSYS modeling methods. The results indicate that the 0.1% ZnO-DW based nanofluids exhibit the highest heat transfer coefficient and efficiency. Both experimental and numerical results show promising and similar outcomes.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Mathematics, Applied
Dolat Khan, Musawa Yahya Almusawa, Waleed Hamali, M. Ali Akbar
Summary: The main objective of this study is to investigate the inclined microchannel flow of a Casson nanofluid based on sodium alginate (SA) under a few stresses. The generalized fractional model is solved using the Laplace and Fourier integral transformations, and the parametric influence of other physical elements is considered. Results show that skin friction and Nusselt number can be enhanced by adding nanoparticles, and the fractional derivative makes the study more realistic.
JOURNAL OF FUNCTION SPACES
(2023)
Article
Mechanics
Yudong Zhang, Xiao Wu, Bangbang Nie, Aiguo Xu, Feng Chen, Ronghan Wei
Summary: In micro- and nanoscale channels, flow characteristics exhibit discontinuity due to the small scale and rarefaction. The conventional continuum-based models are inadequate for describing such flow behavior, therefore adopting kinetic models based on statistical mechanics becomes necessary. This paper presents a novel discrete Boltzmann model specifically tailored for non-equilibrium flows at the micro-nanoscale and demonstrates its effectiveness through numerical simulations.
Article
Chemistry, Physical
Claudio Cazorla, Massimiliano Stengel, Jorge Iniguez, Riccardo Rurali
Summary: We predict a significant variation in heat conductivity in SrMnO3 thin films near room temperature by applying small electric and/or magnetic fields based on first-principles simulations. This is caused by a phase transition that involves large changes in both magnetization and electric polarization, resulting in a relative heat conductivity variation of about 100%. These findings are attributed to the anharmonic spin-phonon couplings that strongly influence the mean lifetime of phonons.
NPJ COMPUTATIONAL MATERIALS
(2023)
