Dòng chảy đối lưu của nanofluid giữa các tấm quay có ảnh hưởng của lực Lorentz

Applied Nanoscience - Tập 13 - Trang 675-683 - 2021
Yahya Ali Rothan1
1Department of Mechanical Engineering, Faculty of Engineering, Jazan University, Jazan, Saudi Arabia

Tóm tắt

Trong nỗ lực hiện tại, để khảo sát hiệu quả của đơn vị, các số Nusselt cũng như hệ số ma sát bề mặt đã được tính toán một cách số. Đơn vị này bao gồm hai tấm quay và trường từ được áp đặt theo chiều dọc. Chất lỏng mang theo là hỗn hợp nước và đồng và chế độ đơn pha được chọn do nồng độ thấp. Với sự tham gia của tác động phân tán nhớt trong phương trình năng lượng, các phương trình cuối cùng đã được thu được. Sau khi sử dụng biến đổi tương đồng, các phương trình thông thường đã được mô hình hóa bằng phương pháp RK4 và bài kiểm tra xác minh cho thấy độ chính xác tốt. Tác động của R và Kr lên Cf có cùng chiều hướng và đều có tác động tích cực. Sự xuất hiện của trường từ làm giảm tác động của R trong khi nâng cao tác động của Kr. Cf tăng khoảng 1,98% khi R tăng lên khi R = 1, M = 0, Kr = 1 và φ = 0,04. Do sự tương tác lớn hơn của vật liệu nano ở tỷ lệ thể tích cao hơn, Cf giảm khi φ tăng và tác động giảm này tăng lên nếu có trường từ xuất hiện. Khi M = 6, R = 1 và Kr = 1, khi φ tăng từ 0 đến 0,04, Cf giảm khoảng 6,1%. Sự gia tăng các lực Lorentz có thể làm tăng Cf khoảng 21,70% khi R = 0,1, Kr = 1 và φ = 0,04. Nu giảm khoảng 1,16% khi M tăng lên khi Kr = 6, R = 1, Ec = 0,04 và φ = 0,04. Nu có mối quan hệ ngược với Ec và Kr. Cả hai yếu tố này đều làm giảm tỷ lệ truyền nhiệt. Nu trải qua sự giảm khoảng 4,68% khi Ec tăng lên khi Kr = 6, R = 1, M = 9 và φ = 0,04. Tác động tích cực của R lên Nu giảm theo sự gia tăng của M.

Từ khóa


Tài liệu tham khảo

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