بررسی تاثیر پارامترهای ترموفیزیکی بر انتقال حرارت در جریان نانوسیال غیر نیوتنی در مبدل حرارتی

نوع مقاله : مقاله پژوهشی

نویسندگان

• حبیب کریمی ¹
• کوروش جواهرده ²

¹ گروه مکانیک، واحد رودسر و املش، دانشگاه آزاد اسلامی، رودسر، ایران.

² دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران.

10.22067/jacsm.2024.86865.1242

چکیده

در مطالعه حاضر به بررسی افزایش انتقال حرارت ترکیبی نانوسیال در سیال غیر نیوتنی در مبدل حرارتی با لوله‌های مارپیچ قائم پرداخته می‌شود. نسبت‌های انحنای مختلف برای لوله‌های مارپیچ قائم و غلظت حجمی نانو ذرات با نسبت‌های ۰ تا ۲٪ در نظر گرفته شده است. همچنین شاخص توانی سیال غیر نیوتنی ۸۱/۰، ۸۵/۰ و ۹۱/۰ انتخاب و از روش عددی حجم محدود و الگوریتم سیمپل برای ارتباط بین معادلات پیوستگی و مومنتم استفاده شد. تاثیر شاخص توانی، عدد ریچاردسون، گام در لوله مارپیچ قائم و غلظت حجمی نانو ذره اکسید آلومینیوم بر روی عدد ناسلت بر روی دیواره برای چهار کویل با نسبت انحنای متفاوت بررسی شد. نتایج نشان داد که افزایش غلظت حجمی نانو ذره اکسید آلومینوم از صفر تا ٪۲ باعث افزایش ضریب انتقال حرارت و ضریب اصطکاک می‌گردد. با تغییر گام بی‌بعد کویل از 05/0 به 1/0، عدد ناسلت میانگین %7 افزایش پیدا نمود. نیروی شناوری بر الگوی توزیع دما و سرعت جریان در لوله‌های مارپیچ تاثیر گذاشته و با افزایش آن، الگوی سرعت جریان یکنواخت‌تر می‌گردد.

کلیدواژه‌ها

• نانو سیال
• سیال غیر نیوتنی
• لوله مارپیچ قائم
• جابه‌جایی ترکیبی
• تحلیل عددی

موضوعات

• انتقال حرارت

---

عنوان مقاله [English]

Study of the Effect of Thermo-Physics Parameters in Nano Fluid Non-Newtonian in the Heat Exchanger

نویسندگان [English]

• habib karimi ¹
• Kourosh Javaherdeh ²

¹ Department of Mechanical Engineering, Roudsar and Amlash Branch, Islamic Azad University, Roudsar, Iran,

² Faculty of Mechanical Eng. University of Guilan

چکیده [English]

This study investigated mixed convection heat transfer laminar flow Non Newtonian in heat exchangers helical coils with Nanofluids. Volumetric concentration of nanoparticles are with 0 to 2% and power law indexes are 0.81, 0.85 and 0.91 in this Non-Newtonian flow. Momentum and energy equations solved based on finite volume and simple algorithm method. The effect of power law index, Richardson number, pitch in helical coils and volumetric concentration of nanoparticles are studied on Nusselt number. Results showed that the heat transfer coefficient was increased by increasing volumetric concentration of nanoparticles from 0 to 2%. Also, Nusselt number increased by decreasing power law index and friction coefficient. Heat transfer coefficient was increased by increasing pitch coil and volumetric concentration of nanoparticles, in other word, Nusselt number is increased with 7% when pitch coil is varied from 0.05 to 0.1. Buoyancy forces effected on pattern of Temperature distribution and velocity of flow in helical coils and Temperature distribution become more uniform with increasing Buoyancy forces.

کلیدواژه‌ها [English]

• Nano fluids
• Non-Newtonian
• heat exchangers helical coils
• mix convection
• Numerical study

مراجع

[1] R. Selbas, Ö. Kızılkan, and M. Reppich, “A new design approach for shell-and-tube heat exchangers using genetic algorithms from economic point of view,” Chemical Engineering and Processing: Process Intensification, vol. 45, no. 4, pp. 268–275, 2006. https://doi.org/10.1016/j.cep.2005.07.004

[2] G. Huminic and A. Huminic, “Heat transfer characteristics in double tube helical heat exchangers using nanofluids,” International Journal of Heat and Mass Transfer, vol. 54, pp. 4280–4287, 2011. https://doi.org/10.1016/j.ijheatmasstransfer.2011.05.017

[3] K. Javaherdeh and H. Karimi, “Numerical analysis of the obstacle effect with different geometry on the heat transfer of nanofluid flow in a rectangular channel,” Journal of Applied and Computational Sciences in Mechanics, vol. 35, no. 3, pp. 51–64, 2023.

[4] M. Naghian and Kh. Hosseini, “Using Collocation Discrete Least Squares Meshless method in solving governing equations for non-Newtonian fluids by Herschel–Bulkley model,” Journal of Solid and Fluid Mechanics, vol. 11, no. 2, pp. 247–259, 2021. https://doi.org/10.22044/jsfm.2021.2183

[5] H. Karimi, H. A. Danesh Ashtiani, and C. Aghanajafi, “Study of mixed materials heat exchanger using optimization techniques,” Journal of Engineering, Design and Technology, vol. 17, no. 2, pp. 414–433, 2019. https://doi.org/10.1108/JEDT-09-2018-0142

[6] H. Karimi, H. Ahmadi-Danesh, and C. Aghanajafi, “Applying multiple decomposition methods and optimization techniques for achieving optimal cost in mixed materials heat exchanger networks,” International Journal of Energy Research, vol. 43, pp. 3711–3722, 2019. https://doi.org/10.1002/er.4526

[7] H. Karimi, H. A. Danesh Ashtiani, and C. Aghanajafi, “Optimization of the total annual cost in a shell and tube heat exchanger by Ant colony optimization technique,” Iranian Journal of Marine Technology, vol. 6, no. 3, pp. 113–121, 2019.

[8] S. Ghanbari and K. Javaherdeh, “Thermal performance enhancement in perforated baffled annuli by nanoporous graphene non-Newtonian nanofluid,” Applied Thermal Engineering, vol. 167, p. 114719, 2020. https://doi.org/10.1016/j.applthermaleng.2019.114719

[9] S. Mozafarie and K. Javaherdeh, “Numerical design and heat transfer analysis of a non-Newtonian fluid flow for annulus with helical fins,” Engineering Science and Technology, an International Journal, vol. 22, no. 4, pp. 1107–1115, 2019. https://doi.org/10.1016/j.jestch.2019.03.001

[10] E. Taheran and K. Javaherdeh, “Experimental investigation on the effect of inlet swirl generator on heat transfer and pressure drop of non-Newtonian nanofluid,” Applied Thermal Engineering, vol. 147, pp. 551–561, 2019. https://doi.org/10.1016/j.applthermaleng.2018.10.034

[11] M. Nemati, M. Sefid, and A. R. Rahmati, “The effect of changing the position of the hot wall and increasing the amplitude and number of oscillations of wavy wall on the flow and heat transfer of nanofluid inside the channel in the presence of magnetic field,” Journal of Solid and Fluid Mechanics, vol. 10, no. 2, pp. 219–236, 2020. https://doi.org/10.22044/jsfm.2020.8917.3022

[12] K. Javaherdeh and H. Karimi, “Numerical analysis of mix convection of sodium alginate non-Newtonian fluid with Al₂O₃ nanoparticle in a channel with block,” Journal of Applied and Computational Sciences in Mechanics, vol. 32, no. 1, pp. 93–110, 2023. https://doi.org/10.22067/jacsm.2021.40042

[13] E. Hosseinirad, V. Bidarian, F. Hormozi, and M. Khoshvaght-Aliabadi, “Modelling and optimization of geometrical parameters in design of the wavy-fin-plate compact heat exchanger by Taguchi method,” Journal of Solid and Fluid Mechanics, vol. 12, no. 3, pp. 89–101, 2022. https://doi.org/10.22044/jsfm.2022.8850.3003

[14] H. Pakdaman, M. Alizadeh, and V. Kalantar, “Numerical investigation of heat transfer and pressure drop in a plate heat exchanger with Chevron plates,” Journal of Applied and Computational Sciences in Mechanics, vol. 25, no. 1, pp. 47–60, 2014.

[15] H. Eskandari and I. Hashemi, “Numerical comparison of shell side thermo-hydraulic characteristics of shell and tube heat exchangers with trefoil and segmental baffle by genetic algorithm,” Journal of Applied and Computational Sciences in Mechanics, vol. 35, no. 2, pp. 55–76, 2023.

[16] M. Kahani, S. Z. Heris, and S. M. Mousavi, “Effects of curvature ratio and coil pitch spacing on heat transfer performance of Al₂O₃/water nanofluid laminar flow through helical coils,” Journal of Dispersion Science and Technology, vol. 34, pp. 1704–1712, 2013. https://doi.org/10.1080/01932691.2013.764485

[17] M. Rakhsha, F. Akbaridoust, A. Abbassi, and S.-A. Majid, “Experimental and numerical investigations of turbulent forced convection flow of nano-fluid in helical coiled tubes at constant surface temperature,” Powder Technology, vol. 283, pp. 178–189, 2015. https://doi.org/10.1016/j.powtec.2015.05.019

[18] G. Yang and M. Ebadian, “Mixed convective flow and heat transfer in a vertical helicoidal pipe with finite pitch,” Computational Mechanics, vol. 14, pp. 503–512, 1994. https://doi.org/10.1007/BF00377602

[19] S. S. Pawar and V. K. Sunnapwar, “Experimental and CFD investigation of convective heat transfer in helically coiled tube heat exchanger,” Chemical Engineering Research and Design, vol. 92, no. 11, pp. 2294–2312, 2014. https://doi.org/10.1016/j.cherd.2014.01.016

[20] S. S. Pawar and V. K. Sunnapwar, “Experimental studies on heat transfer to Newtonian and non-Newtonian fluids in helical coils with laminar and turbulent flow,” Experimental Thermal and Fluid Science, vol. 44, pp. 792–804, 2013. https://doi.org/10.1016/j.expthermflusci.2012.09.024

[21] M. Sheikholeslami, M. Gorji-Bandpy, and D. D. Ganji, “Experimental study on turbulent flow and heat transfer in an air to water heat exchanger using perforated circular-ring,” Experimental Thermal and Fluid Science, vol. 70, pp. 185–195, 2016. https://doi.org/10.1016/j.expthermflusci.2015.09.013

[22] Y. Lin, L. Zheng, and X. Zhang, “Radiation effects on Marangoni convection flow and heat transfer in pseudo-plastic non-Newtonian nanofluids with variable thermal conductivity,” International Journal of Heat and Mass Transfer, vol. 77, pp. 708–716, 2014. https://doi.org/10.1016/j.ijheatmasstransfer.2014.06.028

[23] J. Tian, Z. He, T. Xu, X. Fang, and Z. Zhang, “Rheological property and thermal conductivity of multi-walled carbon nano-tubes-dispersed non-Newtonian nano-fluids based on an aqueous solution of carboxymethyl cellulose,” Experimental Heat Transfer, vol. 29, no. 3, pp. 378–391, 2016. https://doi.org/10.1080/08916152.2014.1001919

[24] M. H. Matin and W. A. Khan, “Laminar natural convection of non-Newtonian power-law fluids between concentric circular cylinders,” International Communications in Heat and Mass Transfer, vol. 43, pp. 112–121, 2013. https://doi.org/10.1016/j.icheatmasstransfer.2013.02.006

[25] K. Javaherdeh, H. Karimi, and A. Khojasteh, “Numerical study of heat transfer enhancement of non-Newtonian nanofluid in porous blocks in a channel partially,” Powder Technology, vol. 383, pp. 270–279, 2021. https://doi.org/10.1016/j.powtec.2021.01.033