CFD study of geometrical parameters effect on heat transfer coefficient during flow boiling in helically coiled tube

Publish Year: 1396
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:

ICHMT03_091

تاریخ نمایه سازی: 7 اسفند 1396

Abstract:

Numerical study of subcooled and saturated flow boiling in the curved and helically coiled tubes is one of the challenging area of computational fluid dynamics (CFD) studies. In this paper, the CFD modeling of bubbly flow boiling in the small helically coiled tube at low vapor quality region are studied. A proper Eulerianbased mathematical model is used for interphase exchange forces and heat transfer between two phases in CFD modeling using bulk boiling model. The results show that, the inner and the bottom wall of the helically coiled tube have the lowest and the highest heat transfer coefficient, respectively. It has been observed that at low vapor quality flows, the heat transfer coefficient is enhanced by decreasing in coil diameter, tube diameter and increasing of coil pitch of helically coiled tube.

Keywords:

CFD simulation , flow boiling , helically coiled tube , boiling heat transfer coefficient

Authors

Mohammad Ali Abdous

Iran University of Science and Technology

Shahriyar Ghazanfari Holagh

Iran University of Science and Technology;

Hamid Saffari

Iran University of Science and Technology;

Masood Shamsaiee

Iran University of Science and Technology;