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Effect of Pin Diameter Degressive Gradient on Heat Transfer in a Microreactor with Non-Uniform Pin-Fin Array under Low Reynolds Number Conditions

Author

Listed:
  • Miao Qian

    (Zhejiang Provincial Key Lab of Modern Textile Machinery, Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China)

  • Jie Li

    (Zhejiang Provincial Key Lab of Modern Textile Machinery, Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China)

  • Zhong Xiang

    (Zhejiang Provincial Key Lab of Modern Textile Machinery, Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China)

  • Chao Yan

    (Zhejiang Provincial Key Lab of Modern Textile Machinery, Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China)

  • Xudong Hu

    (Zhejiang Provincial Key Lab of Modern Textile Machinery, Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China)

Abstract

To improve the efficiency of hydrogen-producing microreactors with non-uniform pin-fin array, the influence of the pin diameter degressive gradient of the non-uniform pin-fin array (NPFA) on heat transfer and pressure drop characteristics is analyzed in this study via numerical simulation under low Reynolds number conditions. Because correlations in prior studies cannot be used to predict the Nusselt number and pressure drop in the NPFA, new heat transfer and friction factor correlations are developed in this paper to account for the effect of the pin diameter degressive gradient, providing a method for the optimized design of the pin diameter degressive gradient for a microreactor with NPFA. The results show that the Nusselt number and friction factor under a low Reynolds number are quite sensitive to the pin diameter degressive gradient. Based on the new correlations, the exponents of the pin diameter degressive gradient for the friction factor and Nusselt number were 6.9 and 2.1, respectively, indicating the significant influence of the pin diameter degressive gradient on the thermal and hydrodynamic characteristics in the NPFA structure.

Suggested Citation

  • Miao Qian & Jie Li & Zhong Xiang & Chao Yan & Xudong Hu, 2019. "Effect of Pin Diameter Degressive Gradient on Heat Transfer in a Microreactor with Non-Uniform Pin-Fin Array under Low Reynolds Number Conditions," Energies, MDPI, vol. 12(14), pages 1-12, July.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:14:p:2702-:d:248558
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    References listed on IDEAS

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    1. Hsueh, Ching-Yi & Chu, Hsin-Sen & Yan, Wei-Mon & Chen, Chiun-Hsun, 2010. "Transport phenomena and performance of a plate methanol steam micro-reformer with serpentine flow field design," Applied Energy, Elsevier, vol. 87(10), pages 3137-3147, October.
    2. Mahmoud S. AbouOmar & Hua-Jun Zhang & Yi-Xin Su, 2019. "Fractional Order Fuzzy PID Control of Automotive PEM Fuel Cell Air Feed System Using Neural Network Optimization Algorithm," Energies, MDPI, vol. 12(8), pages 1-23, April.
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    Cited by:

    1. Shahzada Zaman Shuja & Bekir Sami Yilbas & Hussain Al-Qahtani, 2020. "Influence of Hydrophobic Fin Configuration in Thermal System in Relation to Electronic Device Cooling Applications," Energies, MDPI, vol. 13(7), pages 1-19, April.

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