แบบจำลองเชิงตัวเลข 2 มิติ ของการไหลของอากาศร้อนภายในท่อที่ผนังมีอุณหภูมิคงที่และมีการติดตั้งปล่อง

Abstract

This research studies the natural heat transfer enhancement of an isothermal vertical tube The objective of this study is to explore the heat transfer from the heated tube by adding straight chimney, extended chimney and wide chimney, investigations are carried out for values of the width ratios (D:d) between 1-7, the length ratios (L:L_p) are 0.5, 1 and 1.5 and the length and the width ratios (L_p:d) are 5 and 10. It was found that adding chimney of the heated tube average Nusselt number () increases when it was compared with the case of tube without chimney and the best width ratio of the wide chimney is equal 3, the best period of extended ratios are 3 and 4. The best length ratio is equal to 1.5 and average Nusselt number tends to increase with the length ratio.