Effect of tube inclination on laminar convection in uniformly heated tubes for flat-plate solar collectors

Heat transfer characteristics of assisting and opposing laminar flow through a vertical circular tube at low Reynolds numbers

“…Because these studies focussed specifically on opposing and assisting flow in mixed convection conditions, the heat transfer coefficients were significantly affected by free convection effects and the direction of the flow. Previous studies that focused on inclined tubes [22,26,31,33,34,39] found that free convection effects significantly decreased as the orientation of the heat exchanger was changed from horizontal to vertical. Bashir et al [40] also found that when vertical tubes are used, forced convection conditions could be obtained at heat fluxes as high as 8 kW/m 2 for both assisting and opposing flow for laminar Reynolds numbers greater than 1 000.…”

“…Jackson et al [19] gives a comprehensive review of the work done on mixed convective flow using vertical tubes between 1942 and 1989, while Galanis and Behzadmehr [18] reviewed the work done between 1988 and 2008. For vertical tubes heated at a constant heat flux, several analytical [20][21][22][23], experimental [1,12,13,[23][24][25][26][27][28][29][30][31] and numerical [25,[32][33][34][35][36][37][38] studies investigated the heat transfer characteristics.…”

Soğuk Şartlar Altındaki Bir Boruda MHD Nanoakışkanın Zorlanmış Taşınım ile Isı Transferi

“…Hartmann, manyetik alana maruz iki paralel plaka arasında elektrik iletkenliğe sahip viskoz ve sıkıştırılamaz bir sıvının davranışını araştırmıştır. Bir dairesel kanal içindeki zorlanmış taşınım ile ısı transferi olayı da, güneş kolektörleri, enerji santralleri, yüksek performanslı kazanlar, soğutma-ısıtma sistemleri, kimyasal katalitik reaktörler ve diğer birçok akış hareketi ile ısı transferi uygulamaları gibi birçok teknolojik uygulamaların en önemli konularından biridir [6][7][8][9][10]. Literatürde, farklı nanopartikül tipi, nanopartikül hacimsel oranı, değişik geometri ve sınır şartları ile ilgili birçok çalışma mevcuttur.…”

Natural Convection in an Inclined Cylinder

“…Combined free and forced convection in inclined tubes was studied by Cheng and Hong (1972) for solar collectors. Combined free and forced convection in inclined tubes was studied by Cheng and Hong (1972) for solar collectors.…”