碩士 / 國立成功大學 / 機械工程研究所 / 83 / Fluid flow and heat transfer in a plate-fin and tube heat
exchanger were studied numerically. Flow is incompressible,
three-dimensional and laminar. A commercial PHOENICS code which
is based on the SIMPLE algorithm are used to solve a set of
nonlinear partial differential equations. The effects of
different geometrical parameters such as tube arrangement, tube
row numbers, fin pitch (8-12 fins per inch), tube diameter, and
tube spacing are investigated in detail for the Reynolds number
(based on the fin spacing and the frontal velocity) ranging
from 60 to 900. The local information of pressure and heat
transfer coefficient can offer important message for basic
research and the design of heat exchanger. The average heat
transfer coefficient of staggered arrangement is higher 15﹪-
27﹪than that of in-lined arrangement , while the pressure drop
of staggered configuration is higher 20﹪- 25﹪than that of in-
lined configuration. Average Nusselt number is decreased as the
number of tube row is increased from 1 to 6. It is also found
that the number of tube row has a small effect on the average
heat transfer coefficient as the row numbers are greater than
4. For staggered arrangement, as the tube diameter increases
from 3/8〞to 7/8〞, the average heat transfer coefficient
increase 56﹪, and the pressure drop increases 2.3 times. For
in-lined arrangement, the tube diameter effect has little
influence on average heat transfer coefficient, but the
pressure drop increases as the tube diameter increases. When
the tube spacing is decreased from 44 mm to 28 mm, the average
heat transfer coefficient is increased 62﹪and 32﹪for
staggered and in-lined arrangement, respectively ; the pressure
drop is increased 100 ﹪and 72﹪.
| Identifer | oai:union.ndltd.org:TW/083NCKU0489012 |
| Date | January 1995 |
| Creators | Mu-Cheng Wu, 吳目誠 |
| Contributors | Jiin-Yuh Jang, 張錦裕 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 115 |
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