Modification and experimental validation of simplified Zehner-Bauer-Schlünder model for estimating effective thermal conductivity of gas–solid metal powder beds

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2025-03-15 Epub Date: 2025-01-03 DOI:10.1016/j.powtec.2024.120604

Xiaofeng Mou, Wei Zhou, Zewei Bao, Weixing Huang

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Abstract

Precisely predicting the effective thermal conductivity (ETC) of gas–solid powder beds is crucial for industrial applications. In this study, influence of the Smoluchowski effect on the prediction of ETC under various pressures (p_g) and gas atmospheres was analyzed. Subsequently, the Smoluchowski effect was incorporated to modify all terms associated with gas thermal conductivity in Kunii–Smith (KS) and simplified Zehner–Bauer–Schlünder (S-ZBS) models. Additionally, the modified S-ZBS and KS models were compared to another three classical theoretical models. Results indicate that the modified S-ZBS model showed the highest prediction accuracy, and could estimate precisely ETC of gas–solid powder beds under helium, nitrogen, and argon atmospheres at the temperature (T_ave) of 20 and 60 °C, at p_g = 0.3–4.0 MPa, and under air atmosphere at T_ave = 30–75 °C. Finally, the reliability of the modified S-ZBS model was further validated by measured ETC results of four types of metal powder beds and experimental data from published literature.

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简化zehner - bauer - schl under模型估算气固金属粉末床有效导热系数的修正与实验验证

准确预测气固粉末床层的有效导热系数（ETC）对工业应用至关重要。本文分析了不同气压（pg）和不同气体气氛下斯摩鲁霍夫斯基效应对ETC预测的影响。随后，Smoluchowski效应被纳入到Kunii-Smith （KS）和简化的zehner - bauer - schl (S-ZBS)模型中，以修改与气体导热系数相关的所有术语。此外，还将改进后的S-ZBS和KS模型与另外三种经典理论模型进行了比较。结果表明，改进的S-ZBS模型具有最高的预测精度，能够较准确地预测温度为20℃和60℃、pg = 0.3 ~ 4.0 MPa、Tave = 30 ~ 75℃的氦气、氮气和氩气气氛下气固粉末床的ETC。最后，通过四种金属粉末床的ETC测量结果和文献中已发表的实验数据，进一步验证了修正S-ZBS模型的可靠性。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.