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Heat and Mass Transfer

, Volume 51, Issue 12, pp 1669–1680 | Cite as

Understanding thermo-fluidic characteristics of a glass tube closed loop pulsating heat pipe: flow patterns and fluid oscillations

  • V. K. KarthikeyanEmail author
  • K. Ramachandran
  • B. C. Pillai
  • A. Brusly Solomon
Original

Abstract

An experimental program has been carried out to understand the thermo-fluidic characterization of deionized (DI) water charged closed loop pulsating heat pipe (CLPHP) with flow patterns and fluid oscillations. The CLPHP is examined under vertical and horizontal heating modes with varying heat power. The flow patterns along with fluid oscillations are correlated with thermal performance of the CLPHP. Further, the CLPHP with copper oxide nanofluid study is carried out to understand operational behavior of the device. Fast Fourier frequencies, average frequency of the internal fluid temperature are investigated. Several important features of CLPHP operation are identified by the visual study.

Keywords

Thermal Resistance Effective Thermal Conductivity Thermal Performance Base Fluid Heat Power 
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

A

Area (m2)

CuO

Copper oxide (-)

Cp

Specific heat (J/kgK)

d

Diameter (m)

f

Bubble frequency (Hz)

h

Heat transfer coefficient (W/m2K)

k

Thermal conductivity (W/mK)

L

Length (m)

N

Nucleation site density (m−2)

n

Number of parallel tubes (-)

Q

Heat power (W)

q

Heat flux (W/m2)

R

Thermal resistance (K/W)

r

Radius of tube (m)

T

Temperature (°C)

\(\bar{T}\)

Average temperature (°C)

Subscripts

a

Active

b

Bubble

c

Condenser

cr

Cross section

e

Evaporator

i

Inner

eff

Effective

nf

Nanofluid

o

Outer

tot

Total

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • V. K. Karthikeyan
    • 1
    • 2
    Email author
  • K. Ramachandran
    • 3
  • B. C. Pillai
    • 1
  • A. Brusly Solomon
    • 1
  1. 1.Centre for Research in Material Science and Thermal ManagementKarunya UniversityCoimbatoreIndia
  2. 2.Department of Mechanical EngineeringSri Ramakrishna Engineering CollegeCoimbatoreIndia
  3. 3.Department of PhysicsBharathiar UniversityCoimbatoreIndia

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