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Research Papers

Distribution of Vapor Inside a Cylindrical Minichannel With Evaporative Walls and Its Effect on Droplet Growth by Heterogeneous Nucleation

[+] Author and Article Information
Sushant Anand, Jae Yong Lee, Deepak Veettil, Milind A. Jog

Mechanical Engineering School of Dynamic Systems, College of Engineering and Applied Science, University of Cincinnati, Cincinnati, OH 45221

Sang Young Son1

Mechanical Engineering School of Dynamic Systems, College of Engineering and Applied Science, University of Cincinnati, Cincinnati, OH 45221sangyoung.son@uc.edu

1

Corresponding author.

J. Thermal Sci. Eng. Appl 3(1), 011008 (Apr 07, 2011) (10 pages) doi:10.1115/1.4003767 History: Received December 22, 2010; Revised March 07, 2011; Published April 07, 2011; Online April 07, 2011

The present study aims to understand the dynamics of particle growth inside a minichannel where evaporation from heated wet wall column generates supersaturated conditions. Such multiphase flow with phase-change is encountered in condensation particle sensors where nanoscale particles grow to micrometer size and can be measured optically. To develop condensation particle sensors that are miniscale and highly portable, we have computationally modeled the flow, heat, and mass transfer in a minichannel and determined parameters that facilitate particle growth. The mass, momentum, energy, and species conservation equations are solved, and particles are tracked and their growth through condensation is determined. Variation of thermophysical properties as a function of temperature and species concentration is incorporated for accurate determination of particle growth. The results show that the size of condensation sensors can be decreased by employing minichannels where conditions can be created, which enhance supersaturation region inside the channel where condensation occurs on the nanoparticles by heterogeneous nucleation and cause them to grow to micron sizes. The effects of inlet humidity, inlet temperature, inlet flow rate, and wall temperature on the operation of the miniscale sensor are investigated. The numerical framework provides solution to optimal working of the sensor.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 4

(a) Droplet growth and (b) associated droplet heating at r/R=0 for varying flow rate (Tw=328 K, RHin=0.5, and Tin=298 K)

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Figure 5

Variation of (a) saturation ratio and (b) associated droplet heating for varying wall temperature (Re=139, RHin=0.5, and Tin=298 K) at r/R=0

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Figure 10

Variation of (a) droplet heating and (b) associated droplet growth for varying temperature of inlet fluid stream (Re=139, Tw=328 K, and RHin=0.5) at r/R=0

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Figure 9

Variation of (a) saturation ratio and (b) temperature for varying temperature of inlet fluid stream (Re=139, Tw=328 K, and RHin=0.5) at r/R=0

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Figure 1

Schematic of the model considered for computational modeling for the prototype particle condensation device developed in this work

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Figure 2

Variation of saturation ratio (a) for varying flow rate (Tw=328 K, RHin=0.5, and Tin=298 K) at r/R=0 (b) at different radial locations along axial for flow rate of Re=139 (Tw=328 K, RHin=0.5, and Tin=298 K)

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Figure 3

Variation of (a) temperature at r/R=0. (b) Volume fraction of saturation ratio inside the minichannel for flow rate of Re=139 (Tw=328 K, RHin=0.5, and Tin=298 K).

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Figure 6

Droplet growth for varying wall temperature (Re=139, RHin=0.5, and Tin=298 K) at r/R=0

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Figure 7

Variation of (a) saturation ratio and (b) temperature for varying relative humidity at inlet (Re=139, Tw=328 K, and Tin=298 K) at r/R=0

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Figure 8

Variation of (a) droplet heating and (b) associated droplet growth for varying relative humidity at inlet (Re=139, Tw=328 K, and Tin=298 K) at r/R=0

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