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Heat and Mass Transfer

, Volume 54, Issue 7, pp 2145–2152 | Cite as

Experimental study on the flow/ heat transfer performance of micro-scale pin fin coating with super-hydrophobic surface adding Nano particle

  • Junye Hua
  • Yuanyuan Duan
  • Gui Li
  • Qiong Xu
  • Dong Li
  • Wei Wu
  • Xiaobao Zhao
  • Delai Qiu
Original
  • 132 Downloads

Abstract

The experimental studies on heat transfer and flow resistance characteristics of ellipse-shape micro pin fin have been conducted which is drafted with hydrophobic material, holding the various contact angles fulfilled by adjusting the amount of Nano particle. The results show that with the increases of contact angle(83°,99.5°, 119.5°and 151.5°), the bottom wall temperature rises under the same flow rate. Under a certain heating condition with heating power as 100 W, the average convective heat transfer coefficient decreases with the increase of contact angle with the same Re. The value of Nu for ellipse-shape micro pin fin increases with a higher Re, with the maximum value under experimental condition of Nu as 25. Besides, the friction coefficient of micro pin fin experimental section drafted hydrophobicity treatment significantly decreases, compared with the smooth micro pin fin experimental section (θ = 83°). While the higher contact angle has obvious positive influences on friction coefficient under the same Re. Generally, the flow resistance performance of ellipse-shape micro pin fin drafted with hydrophobic material is better than that without any treatment.

Nomenclature

Symbols

a

Elliptic long axis

A

Total area(m2)

b

Elliptic short axis

cp

Heat capacity at constant pressure, J/(kg·°C)

d

Specific size(m) D equivalent diameter (m)

f

Friction coefficient

h

Heat transfer coefficient W/(m2·K)

L

Length(m)

m

Fin parameters

n

Number of pin fins

Nx

Number of pin fins per row in the flow direction

Nu

Nusslet number

p

pressure(Pa)

Ps

Wetted perimeter(m)

Q

Volume flow rate (m3/s)

Rtot

The total thermal resistance

Re

Reynolds number

S1

Upper distance (m)

S2

Bottom distance(m)

SD

Oblique space(m)

SL

Longitudinal space(m)

ST

Transverse space(m)

t

Temperature(°C)

umax

Maximum velocity in channel minimum cross area(m/s)

v

Kinematic viscosity (m2/s)

W

Channel width(m)

η

Efficiency

λ

Heat conductivity,W/(m·°C)

ρ

Density

μ

Dynamic viscosity (Pa/s) θ contact angle

Ф

Heat transfer amount (kJ)

δY

The relative error

Δf

Relative difference of friction coefficient

ΔNu

Relative difference of Nusslet number av. average t temperature(°C)

Subscript

av

Average

t

Temperature (°C)

Notes

Acknowledgements

This work is supported by the Nature Science Foundation Programs of Jiangsu Province Colleges and Universities (16KJB470008) and Natural Science Foundation of Jiangsu Province of China (BK20151549).

Compliance with ethical standards

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Junye Hua
    • 1
  • Yuanyuan Duan
    • 1
  • Gui Li
    • 2
  • Qiong Xu
    • 1
  • Dong Li
    • 1
  • Wei Wu
    • 1
  • Xiaobao Zhao
    • 1
  • Delai Qiu
    • 1
  1. 1.Engineering Laboratory for Energy System Process Conversion & Emission Control Technology of Jiangsu Province, School of Energy & Mechanical EngineeringNanjing Normal UniversityNanjingChina
  2. 2.Jiangsu Geology Geothermal Energy CO., LTD.NanjingChina

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