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A numerical study on subcooled flow boiling heat transfer in tubes with various helical angles at underwater vehicles conditions

  • Peiyu Chen
  • Shulei LiEmail author
  • Xuefeng Gao
  • Gongnan XieEmail author
Article
  • 28 Downloads

Abstract

As a direct source of power, the water vapor with high temperature and high pressure affects the thermal efficiency of an underwater vehicle power system. In this study, the subcooled flow boiling heat transfer performances in straight and helical tubes are studied at underwater vehicles conditions. A numerical model for the subcooled flow boiling in the tubes is established and verified by the existing experiment data. The local heat transfer capability, and content and distribution of the vapor are analyzed under various thermal conditions and helical angles. The results show that inlet mass flux, heat flux and inlet subcooling have obvious effects on the local heat transfer capacity, vapor content as well as wall temperature. It is found that the maximum local heat transfer coefficient in a helical tube increases by 20.75% compared with that in the straight one. The analyses of vapor volume fraction and secondary flow show that the vapor mainly distributes in the inside and top of tubes, and the secondary flow intensity increases along the axial direction, but it is little influenced by helical angles.

Keywords

Subcooled flow boiling Enhanced heat transfer Helical angle Vapor distribution Secondary flow 

List of symbols

Ab

The wall area covered by the nucleating bubble (m2)

cp

Specific heat (J kg−1 K−1)

d

Diameter (m)

Dw

Bubble departure diameter (m)

f

Frequency of bubble departure

F

The external body force (N)

Flift

The lift force (N)

Fwl

The wall lubrication force (N)

Fvm

The virtual mass force (N)

Ftd

The turbulent dispersion (N)

g

Gravitational acceleration vector (m s−2)

G

Mass flux (kg m−2 s−1)

h

Heat transfer coefficient (kW m−2 K−1)

hlv

Latent heat (J)

i

Specific enthalpy (kJ kg−1)

Ja

Jacob number

k

Thermal conductivity (W m−1 K−1)

Mass transfer

n

Total number of phases

Nw

Nucleate site density (kg m−3)

p

Pressure (Pa)

\(\dot{q}\)

Heat flux (kW m−2)

Q

Intensity of heat exchange

R

Interaction force between phases

S

Source term

t

Time (s)

T

Temperature (K)

v

Velocity vector (m s−1)

x

Quality

Greek symbol

α

Vapor volume fraction

θ

Helical angle (°)

ρ

Density (kg m−3)

κ

Thermal conductivity (W m−1 K−1)

λ

Thermal diffusivity (m2 s−1)

μ

Viscosity (Pa s)

σ

Surface tension force (N)

τ

Stress–strain tensor

ϕ

Contact angle (°)

Subscripts

b

Bubble

cr

Cross section

co

Coiled

C

The convective

E

The evaporation

l

Liquid

p, q

Phase representative

Q

The quenching

sat

Saturation

sub

Subcooling

sup

Superheat

t

Heat transfer

v

Vapor

W

Wall

Notes

Acknowledgements

This research was supported by the National Natural Science Foundation of China (51676163 and 51806176), the Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2018JQ5159), the Fundamental Research Funds for the Central Universities (3102018zy004), the Fundamental Research Fund of Shenzhen City of China (JCYJ20170306155153048) and the National 111 Project (B18041).

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.School of Marine Science and TechnologyNorthwestern Polytechnical UniversityXi’anPeople’s Republic of China
  2. 2.Suzhou Institute of Nano-Tech and Nano-bionicsChinese Academy of SciencesSuzhouPeople’s Republic of China
  3. 3.Research and Development Institute of Northwestern Polytechnical University in ShenzhenShenzhenPeople’s Republic of China

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