Phân tích truyền nhiệt và hệ số ma sát của nanofluid MWCNT trong bộ trao đổi nhiệt ống cuộn đôi hình xoắn

Journal of Thermal Analysis and Calorimetry - Tập 144 - Trang 219-231 - 2020
P. C. Mukesh Kumar1, M. Chandrasekar2
1Department of Mechanical Engineering, University College of Engineering, Dindigul, India
2Department of Mechanical Engineering, Chettinad College of Engineering & Technology, Karur, India

Tóm tắt

Tốc độ truyền nhiệt đối lưu và phân tích hệ số ma sát được xác định với sự trợ giúp của bộ trao đổi nhiệt ống cuộn đôi hình xoắn bằng cách sử dụng nanofluids dựa trên nước có chứa ống nano cacbon đa tường (MWCNT) như một môi trường lạnh. Thí nghiệm này được thực hiện với phương pháp dòng nhiệt không đổi và chế độ dòng chảy laminar trong khoảng 120–180 L h−1. Nồng độ thể tích của nanofluids MWCNT/dựa trên nước từ 0.2–0.6% được chuẩn bị bằng phương pháp hai bước. Có thể thấy rằng nanofluids MWCNT/dựa trên nước có khả năng truyền nhiệt đối lưu cao hơn so với nước. Ngoài ra, cũng nhận thấy rằng quá trình truyền nhiệt tăng lên khi nồng độ thể tích của nanofluids MWCNT/dựa trên nước tăng. Cuối cùng, truyền nhiệt đối lưu cao nhất ghi nhận được là 35% tại nồng độ thể tích 0.6% của nanofluid MWCNT/dựa trên nước ở lưu lượng 140 L h−1 và tại số Dean 1400. Hệ số ma sát khi sử dụng nanofluid MWCNT lớn hơn 40% so với nước trong khoảng số Dean từ 1400–2400.

Từ khóa

#MWCNT #nanofluids #truyền nhiệt đối lưu #hệ số ma sát #bộ trao đổi nhiệt ống cuộn hình xoắn

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