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A Review of the Advances Made in Improving the Durability of Welded Wood against Water in Light of the Results of African Tropical Woods Welding

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Journal of Renewable Materials 2023年第3期11卷 1077-1099页

作者： Jean Jalin Eyinga Biwôlé Achille Bernard Biwolé Antonio Pizzi Joseph Zobo Mfomo César Segovia Atangana Ateba Evariste Fedoung Fongnzossie Sahbi Ouertani Xinyi Chen Bénoît Ndiwe DieudonnéAbessolo Pierre-Jean Meausoone laboratory of Forest Resources and Wood Valorization University of DoualaP.O.Box.2701DoualaCameroon laboratory of Mechanics University of DoualaP.O.Box.2701DoualaCameroon CETELOR University of LorraineP.O.Box.21042EpinalFrance ENSTIB-LERMAB University of LorraineP.O.Box.21042EpinalFrance laboratory of energetics and thermal and mass transfers El Manar University of TunisTunisTunisia

Wood plays a major role in the production of furniture and wooden ***,in this process,the massive use of adhesives and plural connectors remains a definite problem for health and the ***,wood welding is a breakthrough in this *** paper reviews the applications of wood welding in furniture and construction and then examines advances in improving the durability of welded wood against *** contribution also highlights the need to join African tropical woods using the rotational friction welding *** to our results,these woods present interesting chemical singularities,which could provide solutions to the water vulnerability of the welded ***,the use of such a joining method would first free the Cameroonian furniture industry from the chemical industry,secondly position it at the forefront of new eco-design trends and thirdly make it competitive with other countries in the Central African *** works enrich the long and rich bibliography on the technique of wood welding,which has long been conspicuous by its absence of tropical woods.

关键词： Wood welding tropical woods water vulnerability chemical singularities natural durability

Radiative heat transfer and thermal characteristics of Fe-based oxides coated SiC and Alumina RPC structures as integrated solar thermochemical reactor

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Science China(Technological Sciences) 2018年第12期61卷 1788-1801页

作者： GUENE LOUGOU Bachirou SHUAI Yong PAN RuMing CHAFFA Gédéon AHOUANNOU Clément ZHANG Hao TAN HePing Key laboratory of Aerospace Thermophysics of Ministry of Industry and Information Technology Harbin Institute of Technology School of Energy Science and Engineering Harbin Institute of Technology laboratory of energetics and Applied Mechanics (LEMA) Polytechnic College of Abomey-Calavi Abomey-Calavi University

This paper investigated radiative heat transfer and thermal characteristics of Fe-based oxides coated SiC and Alumina reticulated porous ceramic structures as integrated solar thermochemical ***-flux solar radiation absorption and axial temperature distribution in the ceramic foams reactor were analyzed by adopting surface-to-surface radiation model coupled to the P1approximation for radiation heat *** radiative heat transfer and thermal characteristics of different foam-type RPC structures,including SiC,CeO_2,FeAl_2O_4,NiFeAlO_4,Fe_3O_4/SiC,and NiFe_2O_4/SiC were *** mass flow rate and foam structural parameters,including the permeability,pore mean cell size,and extinction coefficients have significantly affected the axial temperature distribution,pressure drop,heat transfer,and fluid *** porous structure to the solar receiver could maximize the incorporation of redox powder in the reacting medium,lower the pressure drop,and enhance the thermal performance of the thermochemical reacting *** structure was the candidate materials in the case where more heat flux and high axial temperature distribution is ***,Fe-based oxide coated Al_2O_3structure could be considered regarding the heat transfer enhancement along with the catalyst activity of oxygen carriers for solar thermochemical reacting system performance.

关键词： solar thermochemical reactor reticulated porous ceramics heat transfer and fluid flow pore mean cell size permeability and pressure drop

Optimization of flue gas convective heat transfer with condensation in a rectangular channel

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Chinese Science Bulletin 2011年第3期56卷 263-268页

作者： SONG WeiMing MENG JiAn LI ZhiXin Key laboratory for thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua University Beijing 100084 China

Conservation equations of sensible entarnsy and latent entransy are established for flue gas convective heat transfer with condensation in a rectangular channel and the entransy dissipation expression is *** field synergy equation is obtained on the basis of the extremum entransy dissipation principle for flue gas convective heat transfer with *** optimal velocity field is numerically obtained by solving the field synergy *** results show that the optimal velocity field has multiple longitudinal vortices,which improve the synergy not only between the veloctiy and temperature fields but also between the velocity and vapor concentration ***,the convective heat and mass transfers are significantly *** with multiple longitudinal vortices close to the optimal velocity field can be generated by discrete double-inclined ribs set in the rectangular *** numerical results show that the total heat transfer rate in the discrete double-inclined rib channel increases by 29.02% and the condensing heat transfer rate increases by 27.46% for Re = 600 compared with the plain channel.

关键词：矩形通道对流换热冷凝烟气优化守恒方程数值求解对流传热

Optimization of flue gas turbulent heat transfer with condensation in a tube

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Chinese Science Bulletin 2011年第19期56卷 1978-1984页

Conservation equations for sensible and latent entransy are established for flue gas turbulent heat transfer with condensation in a tube, and the entransy dissipation expression is deduced. The field synergy equation is obtained on the basis of the extremum entransy dissipation principle for flue gas turbulent heat transfer with condensation. The optimal velocity field is numerically obtained by solving the field synergy equation. The results show that the optimal velocity field contains multiple longitudinal vortices near the tube surface. These improve the synergy not only between the velocity and temperature fields but also between the velocity and vapor concentration fields. Therefore, the turbulent heat and mass transfers are significantly enhanced.

关键词：烟气冷凝传热管湍流优化守恒方程速度场数值求解协同作用

Analysis of CO_2 utilization into synthesis gas based on solar thermochemical CH_4-reforming

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Journal of Energy Chemistry 2019年第1期28卷 61-72页

作者： Bachirou Guene Lougou Yong Shuai Gédéon Chaffa Huang Xing Heping Tan Huibin Du School of Energy Science and Engineering Harbin Institute of Technology Key laboratory of Aerospace Thermophysics of MIIT Harbin Institute of Technology laboratory of energetics and Applied Mechanics (LEMA) Polytechnic College of Abomey-Calavi Abomey-Calavi University College of Metallurgy and Energy North China University of Science and Technology College of Management and Economics Tianjin University

In this study, the solar thermochemical reactor performance for CO_2 utilization into synthesis gas(H_2+ CO) based on CH_4 reforming process was investigated in the context of carbon capture and utilization(CCU) technologies. The P1 radiation heat transfer model is adopted to establish the heat and mass transfer model coupled with thermochemical reaction kinetics. The reactor thermal behavior with direct heat transfer between gaseous reactant and products evolution and the effects of different structural parameters were evaluated. It was found that the reactor has the potential to utilize by ～60% of CO_2 captured with 40% of CH_4 co-fed into syngas(72.9% of H_2 and 27.1% of CO) at 741.31 k W/mof incident radiation heat flux. However, the solar irradiance heat flux and temperature distribution were found to significantly affect the reactant species conversion efficiency and syngas production. The chemical reaction is mainly driven by the thermal energy and higher species conversion into syngas was observed when the temperature distribution at the inner cavity of the reactor was more uniform. Designed a solar thermochemical reactor able to volumetric store concentrated irradiance could highly improve CCU technologies for producing energy-rich chemicals. Besides, the mixture gas inlet velocity, operating pressure and CO_2/CH_4 feeding ratio were crucial to determining the efficiency of CO_2 utilization to solar fuels. Catalytic CO_2-reforming of CH_4 to chemical energy is a promising strategy for an efficient utilization of CO_2 as a renewable carbon source.

关键词： Thermochemical reactor CO2 utilization Radiation flux and temperature distribution CH4-reforming Syngas

Effect of Sinusoidal Heating on Natural Convection Coupled to thermal Radiation in a Square Cavity Subjected to Cross Temperature Gradients

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Journal of Electronics Cooling and thermal Control 2013年第1期3卷 7-21页

作者： Rachid El Ayachi Abdelghani Raji Mohamed Naimi Hassan Elharfi Mohammed Hasnaoui laboratory of Flows and transfers Modelling(LAMET) Physics DepartmentFaculty of Sciences and TechnicsSultan Moulay Slimane UniversityBeni-MellalMorocco laboratory of Fluid Mechanics and energetics(LMFE) Unit Affiliated to CNRST(URAC 27)Physics DepartmentFaculty of Sciences SemlaliaCadi Ayyad UniversityMarrakechMorocco

Coupled natural convection and surface radiation within a square cavity, filled with air and submitted to discrete heating and cooling from all its walls, is studied numerically. The thermally active elements are centrally located on the walls of the cavity. Two heating modes, called SB and SV, are considered. They correspond to bottom and vertical left elements sinusoidally heated in time, respectively, while the top and vertical right ones are constantly cooled. The remaining portions of all the walls are considered adiabatic. The parameters governing the problem are the amplitude and the period of the temporally sinusoidal temperature, the emissivity of the walls , the relative lengths of the active elements and the Rayleigh number . The effect of such parameters on flow and thermal fields and the resulting heat transfer is examined. It is shown that, during a flow cycle, the flow structure can present complex behavior, depending on the emissivity and the amplitude and period of the exciting temperature. The rate of heat transfer is generally enhanced in the case of sinusoidal heating. Also, the resonance phenomenon existence, characterized by maximum fluctuations in flow intensity and heat transfer, is proved in this study.

关键词： Natural Convection thermal Radiation Heatlines Cross Gradients of Temperature Periodic Heating Resonant Heat Transfer Numerical Study

Mixed Convection Heat Transfer for Nanofluids in a Lid-Driven Shallow Rectangular Cavity Uniformly Heated and Cooled from the Vertical Sides:The Opposing Case

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Journal of Electronics Cooling and thermal Control 2013年第3期3卷 111-130页

作者： Hassan El Harfi Mohamed Naimi Mohamed Lamsaadi Abdelghani Raji Mohammed Hasnaoui Physics Department Faculty of Sciences and TechnologiesSultan Moulay Slimane UniversityLaboratory of Flows and Transfers Modelling(LAMET)Beni-MellalMorocco Polydisciplinary Faculty Sultan Moulay Slimane UniversityInterdisciplinary Laboratory of Research in Sciences and Technologies(LIRST)Beni-MellalMorocco Physics Department Faculty of Sciences SemlaliaCadi Ayyad UniversityLaboratory of Fluid Mechanics and Energetics(LMFE)MarrakechMorocco

An investigation on flow and heat transfer due to mixed convection, in a lid-driven rectangular cavity filled with Cu- water nanofluids and submitted to uniform heat flux along with its vertical short sides, has been conducted numerically by solving the full governing equations with the finite volume method and the SIMPLER algorithm. In the case of a slender enclosure, these equations are considerably reduced by using the parallel flow concept. Solutions, for the flow and temperature fields, and the heat transfer rate, have been obtained depending on the governing parameters, which are the Reynolds, the Richardson numbers and the solid volume fraction of nanoparticles. A perfect agreement has been found between the results of the two approaches for a wide range of the abovementioned parameters. It has been shown that at low and high Richardson numbers, the convection is ensured by lid and buoyancy-driven effects, respectively, whereas between these extremes, both mechanisms compete. Moreover, the addition of Cu-nanoparticles, into the pure water, has been seen enhancing and degrading heat transfer by lid and buoyancy-driven effects, respectively.

关键词： Component Nanofluids Mixed Convection Heat Transfer Lid-Driven Cavity Parallel Flow Assumption Finite Volume Method

Conversion potential energy and its application to thermodynamic optimization

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Science China(Technological Sciences) 2012年第8期55卷 2169-2175页

作者： WU Jing GUO ZengYuan College of Energy&Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Key laboratory for thermal Science and Power Engineering of Ministry of Education Department of Engineering MechanicsTsinghua UniversityBeijing 100084China

In general,heat transfers can be classified into two categories according to the purposes of object heating or cooling and the heat to work ***,a new physical quantity,entransy(or potential energy),was proposed to describe the ability of heat transfer with the former *** paper addresses the concept of potential energy in terms of the heat transfer processes for the latter purpose,named the conversion potential *** physical meaning of this newly introduced concept is the potential energy for the heat to work conversion stored in the equivalent mass of heat(thermomass) derived on the basis of the Einstein's special theory of *** dissipation of conversion potential energy occurs during the real irreversible heat to work conversion processes as a measure of the conversion ***,a heat to work conversion problem of a heat exchanger group is provided to show that the minimum conversion potential energy dissipation rate can be used as an optimization criterion for the heat transfer performance with the purpose of the heat to work conversion.

关键词： conversion potential energy entransy optimization exergy thermomass

Computational Analysis of Nanofluid Mixed Convection in a Ventilated Enclosure with Linearly Varying Wall Temperature

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Journal of Physical Science and Application 2016年第6期6卷 49-56页

作者： Ismail Arroub Ahmed Bahlaoui Abdelghani Raji Mohammed Hasnaoui Mohamed Naimi Sultan Moulay Slimane University Polydisciplinary Faculty Interdisciplinary Laboratory of Research in Sciences andTechnologies (LIRST) B.P. 592 Beni-Mella123000 Morocco Sultan Moulay Slimane University Faculty of Sciences and Technologies Laboratory of Flows and Transfers Modelling (LAMET)B.P. 523 Beni-Mella123000 Morocco Cadi Ayyad University Faculty of Sciences Semlalia Laboratory of Fluid Mechanics and Energetics (LMFE) B.P. 2390Marrakech Morocco

The characteristic of flow and heat transfer of A12Oa-water nanofluids flowing through a horizontal ventilated cavity is investigated numerically. The bottom wall is subjected to a linearly varying increasing heating temperature profile, whereas the other boundaries are assumed to be thermally insulated. The enclosure is cooled by an injected or sucked imposed flow. The simulations are focused specifically on the effects of different key parameters such as Reynolds number, 200 〈 Re 〈 5,000, nanoparticles concentration, 0 〈 φ 〈 0.1, and mode of imposed flow, on the flow and thermal patterns and heat transfer performances. The findings demonstrate clearly the positive role of the nanoparticles addition on the improvement of the heat transfer rate and the mean temperature within the cavity. Also, the results presented show that, the suction mode is more favorable to the heat transfer in comparison with the case of the injection mode. The cooling efficiency is found to be more pronounced by applying the suction mode.

关键词： Mixed convection nanofluid injection suction linearly varying heating ventilated cavity.