بررسي عددي جريان آشفته نانوسيال و قطر نانوذرات بر انتقال حرارت در يك كانال موجي شكل

Numerical investigation of turbulent nanofluid flow and nanoparticle diameter on heat transfer in a wavy form channel

ﻣﻄﺎﻟﻌﻪ ﻋﺪدي اﻧﺘﻘﺎل ﺣﺮارت و ﻫﯿﺪرودﯾﻨﺎﻣﯿﮏ ﺟﺮﯾﺎن آﺷﻔﺘﻪ و آرام ﻧﺎﻧﻮﺳﯿﺎل ﺑﺼﻮرت ﺗﺮاﮐﻢ ﻧﺎﭘﺬﯾﺮ، در ﯾﮏ ﮐﺎﻧﺎل ﻣﻮﺟﯽ ﺑﺎ روش ﺣﺠﻢ ﻣﺤﺪود ﺑﺮرﺳﯽ ﺷﺪه و ﭘﺎراﻣﺘﺮﻫﺎي ﻧﺴﺒﺖ ﻗﻄﺮي، ﮐﺴﺮﺣﺠﻤﯽ و ﻗﻄﺮ ﻧﺎﻧﻮذرات در ﭼﻬﺎر رﯾﻨﻮﻟﺪز ﺗﺤﻠﯿﻞ و ﻧﺘﺎﯾﺞ ﻋﺪد ﻧﺎﺳﻠﺖ، اﻓﺖ ﻓﺸﺎر و ﺿﺮﯾﺐ ﻋﻤﻠﮑﺮد اﺳﺘﺨﺮاج ﺷﺪه اﺳﺖ. اﻋﺘﺒﺎرﺳﻨﺠﯽ، ﺑﺎ ﻣﻄﺎﻟﻌﺎت ﻋﺪدي و رواﺑﻂ ﺗﺤﻠﯿﻠﯽ ﻣﻘﺎﯾﺴﻪ ﺷﺪه و ﻧﺘﺎﯾﺞ از ﻫﻤﺒﺴﺘﮕﯽ ﻣﻨﺎﺳﺒﯽ ﺑﺮﺧﻮردار ﺑﻮده اﺳﺖ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داده ﮐﻪ اﺳﺘﻔﺎده از اﻧﺤﻨﺎي ﺳﻄﺢ اﻧﺘﻘﺎل ﺣﺮارت و اﻓﺖ ﻓﺸﺎر را ﺑﺘﺮﺗﯿﺐ 1/78 و 8/1 ﺑﺮاﺑﺮ ﮐﺮده و از ﻃﺮﻓﯽ اﻓﺰاﯾﺶ ﮐﺴﺮﺣﺠﻤﯽ ﻧﺎﻧﻮﺳﯿﺎل اﻧﺘﻘﺎل ﺣﺮارت و اﻓﺖ ﻓﺸﺎر را ﺑﻪ ﻣﯿﺰان 2/1 و 3 ﺑﺮاﺑﺮ اﻓﺰاﯾﺶ داده اﺳﺖ. ﻫﻤﭽﻨﯿﻦ اﺳﺘﻔﺎده از ﺟﺮﯾﺎن آرام در ﻣﻘﺎﯾﺴﻪ ﺑﺎ ﺟﺮﯾﺎن آﺷﻔﺘﻪ در ﻣﺤﺪود رﯾﻨﻮﻟﺪز 1000 ﻧﯿﺰ ﺿﺮﯾﺐ ﻋﻤﻠﮑﺮد ﺑﺎﻻﺗﺮي داﺷﺘﻪ اﺳﺖ.

Numerical study of turbulent and laminar flow is investigated for an incompressible nanofluid flow in a 2D wavy channel by using the finite volume method (FVM). The results of the Nusselt number, pressure drop, and thermal performance has obtained for diameter ratios (a/b=0, 0.25, 0.5, 0.75, 1), volume concentration(FI = 0%, 2%, 4%) and nanoparticle diameters in four Reynolds number(Re=10000, 20000, 30000, 40000). The validation was compared with analytical and numerical studies. The results shown a good convergence between them . The results showed that using wavy parts caused to increasing in heat transfer rate and pressure drop by 1.78 and 8.1 times respectively. Additionally, augmentation of the volume concentration increased the heat transfer rate and pressure drop by 2.1 and 3 times respectively. The use of laminar flow also had a higher heat transfer rate, pressure drop and, thermal performance compared to turbulent flow within the Reynolds 1000 range.