Numerical analysis of clogging dynamics in micromachined Joule–Thomson coolers

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2 Citations (Scopus)

Abstract

Micromachined Joule–Thomson (JT) coolers are of interest for cooling small electronic devices. The long-term performance of JT microcoolers is limited by the clogging phenomenon caused by the deposition of water molecules present as impurity in the working fluid. This work investigates the clogging dynamics in a JT microcooler operating with nitrogen gas. A numerical model is developed to calculate the temperature profile and the deposition rate of water molecules along the counter flow heat exchanger and the restriction of a microcooler. The deposition process is modeled by considering the diffusion of water molecules in nitrogen gas and the kinetic process of water molecules on wall surface, which are both temperature dependent. Numerical results show that the clogging rate during cool down is influenced by gas impurity and gas pressure. The effects of gas purity, gas pressure and cold-end temperature on the continuous operating time of the microcooler are also investigated.

Translated title of the contributionNumerical analysis of clogging dynamics in micromachined Joule–Thomson coolers
Original languageFrench
Pages (from-to)60-68
Number of pages9
JournalInternational journal of refrigeration
Volume81
DOIs
Publication statusPublished - 1 Sep 2017

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Numerical analysis
Gases
Molecules
Water
Impurities
Nitrogen
Deposition rates
Temperature
Heat exchangers
Numerical models
Cooling
Kinetics
Fluids

Keywords

  • Clogging
  • Deposition
  • Joule–Thomson
  • Microcooler
  • Water molecules

Cite this

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title = "Analyse num{\'e}rique des dynamiques d'obstruction dans les refroidisseurs Joule-Thomson micro-usin{\'e}s",
abstract = "Micromachined Joule–Thomson (JT) coolers are of interest for cooling small electronic devices. The long-term performance of JT microcoolers is limited by the clogging phenomenon caused by the deposition of water molecules present as impurity in the working fluid. This work investigates the clogging dynamics in a JT microcooler operating with nitrogen gas. A numerical model is developed to calculate the temperature profile and the deposition rate of water molecules along the counter flow heat exchanger and the restriction of a microcooler. The deposition process is modeled by considering the diffusion of water molecules in nitrogen gas and the kinetic process of water molecules on wall surface, which are both temperature dependent. Numerical results show that the clogging rate during cool down is influenced by gas impurity and gas pressure. The effects of gas purity, gas pressure and cold-end temperature on the continuous operating time of the microcooler are also investigated.",
keywords = "Clogging, Deposition, Joule–Thomson, Microcooler, Water molecules",
author = "Cao, {H. S.} and S. Vanapalli and Holland, {H. J.} and Vermeer, {C. H.} and {ter Brake}, {H. J.M.}",
year = "2017",
month = "9",
day = "1",
doi = "10.1016/j.ijrefrig.2017.05.023",
language = "French",
volume = "81",
pages = "60--68",
journal = "International journal of refrigeration",
issn = "0140-7007",
publisher = "Elsevier",

}

TY - JOUR

T1 - Analyse numérique des dynamiques d'obstruction dans les refroidisseurs Joule-Thomson micro-usinés

AU - Cao, H. S.

AU - Vanapalli, S.

AU - Holland, H. J.

AU - Vermeer, C. H.

AU - ter Brake, H. J.M.

PY - 2017/9/1

Y1 - 2017/9/1

N2 - Micromachined Joule–Thomson (JT) coolers are of interest for cooling small electronic devices. The long-term performance of JT microcoolers is limited by the clogging phenomenon caused by the deposition of water molecules present as impurity in the working fluid. This work investigates the clogging dynamics in a JT microcooler operating with nitrogen gas. A numerical model is developed to calculate the temperature profile and the deposition rate of water molecules along the counter flow heat exchanger and the restriction of a microcooler. The deposition process is modeled by considering the diffusion of water molecules in nitrogen gas and the kinetic process of water molecules on wall surface, which are both temperature dependent. Numerical results show that the clogging rate during cool down is influenced by gas impurity and gas pressure. The effects of gas purity, gas pressure and cold-end temperature on the continuous operating time of the microcooler are also investigated.

AB - Micromachined Joule–Thomson (JT) coolers are of interest for cooling small electronic devices. The long-term performance of JT microcoolers is limited by the clogging phenomenon caused by the deposition of water molecules present as impurity in the working fluid. This work investigates the clogging dynamics in a JT microcooler operating with nitrogen gas. A numerical model is developed to calculate the temperature profile and the deposition rate of water molecules along the counter flow heat exchanger and the restriction of a microcooler. The deposition process is modeled by considering the diffusion of water molecules in nitrogen gas and the kinetic process of water molecules on wall surface, which are both temperature dependent. Numerical results show that the clogging rate during cool down is influenced by gas impurity and gas pressure. The effects of gas purity, gas pressure and cold-end temperature on the continuous operating time of the microcooler are also investigated.

KW - Clogging

KW - Deposition

KW - Joule–Thomson

KW - Microcooler

KW - Water molecules

UR - http://www.scopus.com/inward/record.url?scp=85021726176&partnerID=8YFLogxK

U2 - 10.1016/j.ijrefrig.2017.05.023

DO - 10.1016/j.ijrefrig.2017.05.023

M3 - Article

VL - 81

SP - 60

EP - 68

JO - International journal of refrigeration

JF - International journal of refrigeration

SN - 0140-7007

ER -