Investigation of empirical correlations on the determination of condensation heat transfer characteristics during downward annular flow of R134a inside a vertical smooth tube using artificial intelligence algorithms

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Balcilar M., Dalkili็ A.S., Bolat B., Wongwises S.

ผู้เผยแพร่: Springer

ปีที่เผยแพร่ (ค.ศ.): 2011

วารสาร: Journal of Mechanical Science and Technology (1738-494X)

Volume number: 25

Issue number: 10

หน้าแรก: 2683

หน้าสุดท้าย: 2701

จำนวนหน้า: 19

นอก: 1738-494X

eISSN: 1976-3824

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-80053922185&doi=10.1007%2fs12206-011-0618-2&partnerID=40&md5=f8b34b3f4e129af055e1fb21116a2580

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

The heat transfer characteristics of R134a during downward condensation are investigated experimentally and numerically. While the convective heat transfer coefficient, two-phase multiplier and frictional pressure drop are considered to be the significant variables as output for the analysis, inputs of the computational numerical techniques include the important two-phase flow parameters such as equivalent Reynolds number, Prandtl number, Bond number, Froude number, Lockhart and Martinelli number. Genetic algorithm technique (GA), unconstrained nonlinear minimization algorithm-Nelder-Mead method (NM) and non-linear least squares error method (NLS) are applied for the optimization of these significant variables in this study. Regression analysis gave convincing correlations on the prediction of condensation heat transfer characteristics using ฑ30% deviation band for practical applications. The most suitable coefficients of the proposed correlations are depicted to be compatible with the large number of experimental data by means of the computational numerical methods. Validation process of the proposed correlations is accomplished by means of the comparison between the various correlations reported in the literature. ฉ 2011 The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.

คำสำคัญ

Nelder-mead method, Non-linear least squares, Unconstrained nonlinear minimization algorithm