Heat and Mass Transfer

, Volume 54, Issue 3, pp 631–639 | Cite as

Effects of geometrical parameters on thermal-hydraulic performance of wavy microtube

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Abstract

Laminar flow and heat transfer characteristics of water flow through wavy microtubes (WMTs) with different values of wave length (l) and wave amplitude (a) are investigated experimentally. The tested WMTs are fabricated from copper microtube with the internal diameter of 914 μm. Experiments encompass the Reynolds numbers from 640 to 1950. In order to validate the experimental setup and create a base line for comparison, initial tests are also carried out for a straight microtube. The results show that both the heat transfer coefficient and the pressure drop are strongly affected by the studied geometrical factors. For a given Reynolds number, these parameters increase as the wave length decreases and the wave amplitude increases. However, in the studied ranges, the effect of wave amplitude is more than that of wave length. A considerable thermal-hydraulic factor of 1.78 is obtained for a WMT with l = 14.3 mm and a = 6 mm. Finally, correlations are developed to predict the Colburn factor and friction factor of water flow in the WMTs.

Nomenclature

∆P

pressure drop, Pa

∆T

temperature difference, K

A

total surface area, m2

a

wave amplitude, m

Cp

specific heat capacity, J.kg−1.K−1

D

diameter of microtube, m

G

mass velocity, kg.m−2.s−1

h

heat transfer coefficient W.m−2.K−1

L

length of microtube, m

l

straight section, m

m

mass flow rate, kg.s−1

Qconv

convective heat transfer rate, W

P

pressure, Pa

T

temperature, K

Greek symbols

ρ

density, kg.m−3

μ

dynamic viscosity, Pa.s

κ

thermal conductivity, W.m−1.K−1

Dimensionless groups

f

Friction factor

j

Colburn factor

Nu

Nusselt number

Re

Reynolds number

Subscripts

b

bulk fluid

b,in

fluid inlet

b,out

fluid outlet

LMTD

logarithmic mean temperature difference

w

wall

Acronyms

MT

Microtube

WMT

Wavy Microtube

Notes

Acknowledgments

The authors would like to express their thanks to Islamic Azad University (IAU) Shahrood Branch for the supports through the setup fabrication and research implementation.

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Department of Chemical Engineering, Shahrood BranchIslamic Azad UniversityShahroodIran

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