Investigation of Heat Transfer in Dropwise Condensation Facilitated by a Humid Airflow

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dc.contributor.advisorAmirfazli, Alidad
dc.contributor.advisorKempers, Roger
dc.contributor.authorShakeri Bonab, Milad
dc.date.accessioned2022-12-14T16:20:56Z
dc.date.available2022-12-14T16:20:56Z
dc.date.copyright2022-03-04
dc.date.issued2022-12-14
dc.date.updated2022-12-14T16:20:55Z
dc.degree.disciplineMechanical Engineering
dc.degree.levelDoctoral
dc.degree.namePhD - Doctor of Philosophy
dc.description.abstractIt is necessary to understand humid air condensation because of its various applications, such as water harvesting, and environment control and life support systems. Improvement of the heat transfer rate by facilitating condensate removal (shedding of droplets) from the surface can decrease operational costs. Droplets can be shed by using airflow. Parameters such as relative humidity (RH), airflow velocity, and subcooling (T_sc) play a substantial role in condensation and heat transfer rate. Therefore, understanding the effect of these parameters is essential to analyze and evaluate the performance of the systems reliant on condensation. Firstly, this work is dedicated to investigating the influence of airflow on the condensation heat transfer coefficient (HTC) of humid air on a horizontal surface. A mini closed-looped wind tunnel was used to simulate the condensation environment and control condensation parameters. Airflow velocities from 1 to 15 m/s were investigated because the condensate's shedding usually happens in this range. Also, an RH of 10–80% and T_sc of 0–10°C were used to achieve both single-phase and condensation regimes. Transient and instantaneous heat flux measurements were required to study the relationship between condensate morphology and HTC. To facilitate this, a transient inverse heat conduction method was used to characterize the time-varying surface heat flux and associated HTC. A 5-fold decrease in response time was found for the transient method compared to the steady-state method. The effect of condensation parameters on the HTC and the relationship between condensate morphology and HTC is discussed. The results show that HTC for the subcooling of T = 0°C is smaller than for other temperatures. Also, the effect of RH on condensation was investigated, and higher HTC was found for higher RHs. The results clearly show that the shedding of condensate kept the average droplet size low and doubled heat transfer performance improvement.
dc.identifier.urihttp://hdl.handle.net/10315/40617
dc.languageen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectMechanical engineering
dc.subjectEnergy
dc.subjectDesign
dc.subject.keywordsHumid air condensation
dc.subject.keywordsTransient heat conduction
dc.subject.keywordsDropwise condensation
dc.subject.keywordsSurface coating
dc.subject.keywordsDroplet shedding
dc.subject.keywordsMicrogravity
dc.subject.keywordsElectrowetting
dc.subject.keywordsHeat transfer
dc.titleInvestigation of Heat Transfer in Dropwise Condensation Facilitated by a Humid Airflow
dc.typeElectronic Thesis or Dissertation

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