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Heat and Mass Transfer

, Volume 52, Issue 12, pp 2823–2831 | Cite as

Experimental study on EHD heat transfer enhancement from flush-mounted ribbons with different arrangements of wire electrodes in a channel

  • Amin Alami niaEmail author
  • Antonio Campo
Original

Abstract

In the present study, the heat transfer enhancement of a bundle of flush-mounted ribbons placed on the floor of a rectangular duct was investigated experimentally. The flush-mounted ribbons act as heat sources and the cooling happens with air. The air flow was three-dimensional, steady, viscous and incompressible under both laminar and turbulent conditions (\(500 \le \text{Re}_{{D_{h} }} \le 4500\)). The hydrodynamics and heat transfer behavior of the air flow was studied by means of an active method with application of corona wind. The state of the art of this work revolves around an experimental investigation of an electrohydrodynamics (EHD) active method and heat transfer enhancement from the surfaces of the flush-mounted ribbons. Due to the intricacies of the required experiment, a special apparatus needed to be designed and constructed. The aim of this work is application of EHD active method for convective heat transfer enhancement. In this method the different arrangement of wire electrodes has been achieved. The results show that in same Reynolds numbers and voltages of wires, the heat transfer enhancement was increase in arrangement 1 than other 4 arrangements.

Keywords

Reynolds Number Test Section Secondary Flow Heat Transfer Enhancement Active Method 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

b

Mobility of ions (m2 V−1 s−1)

C

Distance between wire and ground electrodes (m)

D

Diameter of pipe (m)

d

Diameter of orifice (m)

Dh

Hydraulic diameter (m)

Et

Heat transfer enhancement ratio

Elost

Consumed power ratio

E0

Electric field (V m−1)

H

Channel height (m)

h

Heat transfer coefficient (W m−2 K−1)

hs

Heat transfer coefficient for plain case (W m−2 K−1)

I0

Electric current of corona wind (A)

IEHD

EHD strength

L

Width of flush mounted ribbon (m), characteristic length (m)

L1

Length of upstream region (m)

L2

Length of downstream region (m)

NEHD

EHD number

P

Pressure (Pa)

qrib′′

Constant heat flux from flush mounted ribbon (W m−2)

qe0

Electric charge of one electron (Coulomb)

Re

Reynolds number

\(\text{Re}_{{D_{h} }}\)

Reynolds number based on hydraulic diameter

r

Radius of wire electrode (m)

reff

Effective radius of wire to ground electrode (m)

S

Separation between flush mounted ribbons (m)

T

Temperature (K, °C)

u

Velocity (m s−1)

ui

Velocity of electric ions (m s−1)

W

Width of channel (m)

x, y, z

Cartesian coordinates

Greek symbols

α

View angle between wire and ground electrodes

β

The ratio of orifice to pipe diameter

ηe

Performance evaluation criteria (PEC)

υ

Kinematics viscosity (m2 s−1)

ρf

Density of fluid (kg m−3)

ρe

Density of electric charge (kg m−3)

Δ

Difference

Subscripts

D

Diameter of pipe

E

Efficiency

e

Electron

f

Fluid

Ideal

Ideal condition

i

Ions

ref

Reference condition

s

Plain case

w

Flush mounted ribbon wall

Superscripts

·

Time rate

Flux

Average

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringAzarbaijan Shahid Madani UniversityTabrizIran
  2. 2.Department of Mechanical EngineeringThe University of Texas at San AntonioSan AntonioUSA

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