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Measurement of Heat Transfer Rates under a Liquid Drop During Dropwise Condensation

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Drop Dynamics and Dropwise Condensation on Textured Surfaces

Part of the book series: Mechanical Engineering Series ((MES))

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Abstract

The quasi-periodic and statistical nature of drop formation, along with very high heat transfer coefficients at low operating temperature difeerentials, makes the experimental determintaion of transfer coefficients quite challenging. We demonstrate the use of high resolution Liquid Crystal Thermography (LCT) coupled with digital videography to measure the spatial distribution of temperature during dropwise condensation in the pendant mode over a polyethylene substrate. Using a one-dimensional heat transfer model, heat flux profiles through individual condensing droplets have been obtained. The measured heat flux as a function of drop diameter matches published data for large drop sizes but fails for small drops (< 0.4 mm) where the thermal resistance of the LCT sheet is a limiting factor. To a first approximation, the present work shows that drop size can be correlated to the local heat flux. It is demonstrated that the average condensation heat flux over a surface can be obtained entirely from the drop-size distribution.

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Abbreviations

A :

Area, m2

D :

Diameter, m

g :

Acceleration due to gravity, m/s2

H, S, I:

Hue, Saturation, Intensity scale, −

h :

Heat transfer coefficient, W/m2K

h fg :

Latent heat, J/kg

K 1 :

Constant, −

k :

Thermal conductivity, W/mK

M :

Molecular weight, kg/kmol

n :

Number density, m−2

P :

Pressure, N/m2

\( \dot{Q} \) :

Heat transfer rate, W

q ″ :

Heat flux, W/m2

R :

Gas constant, J/K-mole

R, G, B:

Red, Green, Blue scale, −

T :

Temperature, K

\( \overline{T} \) :

Average temperature, K

t :

Thickness, m

υ :

Specific volume, m3/kg

λ :

Wavelength of light, m

\( \overset{\frown }{\sigma } \) :

Accommodation coefficient, −

σ :

Surface tension, N/m

ρ :

Density, kg/m3

avg:

Average value

exp:

Experimental

liq:

Liquid

max:

Maximum

min:

Minimum

pix:

Digitized pixel

sat:

Saturation

sub:

Substrate

total:

Total value

vap:

Vapor

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, India

    Gagan Bansal, S. Khandekar & K. Muralidhar

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  1. Gagan Bansal
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  2. S. Khandekar
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  3. K. Muralidhar
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Bansal, G., Khandekar, S., Muralidhar, K. (2020). Measurement of Heat Transfer Rates under a Liquid Drop During Dropwise Condensation. In: Drop Dynamics and Dropwise Condensation on Textured Surfaces. Mechanical Engineering Series. Springer, Cham. https://doi.org/10.1007/978-3-030-48461-3_14

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  • DOI: https://doi.org/10.1007/978-3-030-48461-3_14

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-48460-6

  • Online ISBN: 978-3-030-48461-3

  • eBook Packages: EngineeringEngineering (R0)

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