Effect of particle size, flow velocity and heat flux on heat transfer cofficent in fluidized bed column
Joint Authors
al-Turaihi, Riyad S.
al-Hattab, Tahsin Ali Husayn
Source
The Iraqi Journal for Mechanical and Materials Engineering
Issue
Vol. 2010, Issue B(s) (31 Dec. 2010), pp.258-268, 11 p.
Publisher
University of Babylon College of Engineering
Publication Date
2010-12-31
Country of Publication
Iraq
No. of Pages
11
Main Subjects
Abstract AR
يتضمن البحث دراسة عملية لتأثير كل من حجم الجزيئات الصلبة, رقم رينولدز و معدل سريان الحرارة على معامل انتقال الحرارة في الجريان ثنائي الطور (غاز – صلب) في الحالة المستقرة.
لقد تم استخدام الرمل كمادة صلبة و بثلاث أقطار مختلفة (μ m 525,725 and 925) و استخدام الهواء كوسط للتميع و بثلاث سرع مختلفة هي (1,9 و 2,7, 2,2 و 2,9 م/ث) و جهز الجهاز بمسخن أنبوبي أفقي ذات قطر خارجي (3,175 سم) جهز بقدرات كهربائية مختلفة (150, 120, 90, 69 واط).
لقد بينت النتائج بأن هنالك توزيع محوري لدرجات الحرارة عند جميع السرع المستخدمة و تزداد هذه الدرجات مع زيادة سرع الهواء و تزداد مع نقصان حجم الجزيئات الصلبة و زيادة معدلات سريان الحرارة.
تم الحصول على معادلات تجريبية جديدة لحساب قيم (Nup) اعتمادا على كل من (Frp, Rep) تمثل يالعلاقة التالية : Nup = ( 0.738 ReP0.57Frp0.48)/(5.23 + 0.0042 Rep) 61 < Rep < 168 406
Abstract EN
An experimental study to investigate the effect of the particle size (dp) and Reynolds number (Re) for different values of heat flux on the heat transfer coefficient (h) in gas-solid fluidized bed was done.
In this work three different sizes of sand particles were employed (525,725 and 925 μ m).
The fluidizing medium was air at different velocities in the range of (1.9-2.9 m / s).
The rig provided with a horizontal heating tube with outer diameter of (3.175cm) was heated eclectically with different power supplies (69, 90, 120 and 150 W).
The fluidized bed temperature profiles were evaluated axially in the fluidized bed for different positions.
The recording and the monitoring of these measurements were done by an interface system connected with PC computer.
The results show that the temperature distribution decreases with increase particle size and the heat flux represents as the temperature increases as the air velocities increase.
A new empirical correlation was suggested in this study.
The correlation predicts the value of (Nup) as a function of both (Rep) and (Frp).
All the dimensionless groups are determined based on particle diameter.
Nup = 0.0738 Rep 0.57 Frp 0.48 \ 5.23 + 0.0042 Rep 61 < Rep < 168 406 < Frp < 1675.
American Psychological Association (APA)
al-Hattab, Tahsin Ali Husayn& al-Turaihi, Riyad S.. 2010. Effect of particle size, flow velocity and heat flux on heat transfer cofficent in fluidized bed column. The Iraqi Journal for Mechanical and Materials Engineering،Vol. 2010, no. B(s), pp.258-268.
https://search.emarefa.net/detail/BIM-331310
Modern Language Association (MLA)
al-Hattab, Tahsin Ali Husayn& al-Turaihi, Riyad S.. Effect of particle size, flow velocity and heat flux on heat transfer cofficent in fluidized bed column. The Iraqi Journal for Mechanical and Materials Engineering No. B (2010), pp.258-268.
https://search.emarefa.net/detail/BIM-331310
American Medical Association (AMA)
al-Hattab, Tahsin Ali Husayn& al-Turaihi, Riyad S.. Effect of particle size, flow velocity and heat flux on heat transfer cofficent in fluidized bed column. The Iraqi Journal for Mechanical and Materials Engineering. 2010. Vol. 2010, no. B(s), pp.258-268.
https://search.emarefa.net/detail/BIM-331310
Data Type
Journal Articles
Language
English
Notes
Includes appendix : p. 268
Record ID
BIM-331310