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Heat and Mass Transfer

, Volume 53, Issue 8, pp 2487–2495 | Cite as

Pool boiling of distilled water over tube bundle with variable heat flux

  • Abhilas SwainEmail author
  • Rajiva Lochan Mohanty
  • Mihir Kumar Das
Original

Abstract

The experimental investigation of saturated pool boiling heat transfer of distilled water over plain tube bundle, under uniform and varying heat flux condition along the height are presented in this article. Experiments are carried out under various heat flux configurations applied to rows of tube bundles and pitch distance to diameter ratios of 1.25, 1.6 and 1.95. The wall superheats and pool boiling heat transfer coefficients over individual rows are determined. The pool boiling heat transfer coefficients for variable heat flux and uniform heat flux conditions are compared. The results indicate that the bundle effect is found to exist for uniform as well as variable heat flux under all operating conditions in the present investigation. The variable heat flux resulted in range of wall superheat being highest for decreasing heat flux from bottom to top and lowest for increasing heat flux from bottom to top.

Keywords

Heat Flux Heat Transfer Coefficient Diameter Ratio Boiling Heat Transfer Tube Bundle 
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

D

Diameter of tube (mm)

do

Outside diameter of tube (mm)

dtc

Pitch circle diameter for thermocouples (mm)

HTC

Heat transfer coefficient (W/m2K)

K

Thermal conductivity of tube material (W/mK)

L

Heated length of tubes (mm)

P/D

Pitch to diameter ratio of a bundle

Q

Power input to cartridge heater (W)

q

Heat flux applied to tubes (kW/m2)

Ts

Surface temperature of tubes (K)

Ttc

Temperature measured by thermocouples (K)

Tl

Liquid temperature (K)

δTw

Drop in temperature (K)

Subscripts

o

Outer surface

tc

Thermocouple position

w

Wall thickness

Notes

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 Berlin Heidelberg 2017

Authors and Affiliations

  • Abhilas Swain
    • 1
    Email author
  • Rajiva Lochan Mohanty
    • 1
  • Mihir Kumar Das
    • 1
  1. 1.School of Mechanical SciencesIndian Institute of Technology BhubaneswarBhubaneswarIndia

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