Abstract

In nucleate pool boiling, a thin film is formed under the nucleating bubble in the region where the solid, liquid and vapor phases meet. This is called the three-phase contact line region. High rates of heat transfer have been observed in this region. Researchers have developed a pool boiling apparatus with laser interferometry and artificial nucleation sites to observe the changes in thickness, frequency, velocity and the dynamic contact angle of the microlayer. Similarly, multiple meniscus studies have been conducted to observe the characteristics of microlayer in pool boiling and various other applications such as ink jet printing, miniature heat pipes, spray cooling and drop wise condensation. In this research we look at the effect of temperature on dynamic micro contact angle and contact line velocities on a heated and polished copper surface. An apparatus was designed to oscillate a meniscus on the same copper surface. The meniscus was fed liquid to compensate for the evaporation thus making the meniscus stable. A laser source and an optical camera were incorporated to analyze the three-phase contact line region. The effect of the perimeter of the base of the meniscus and frequency of oscillating meniscus was studied. Contribution of contact line heat transfer was reported, and characteristics of microlayer formed in the contact line area of an oscillating meniscus were observed over one oscillation period.

Publication Date

11-2019

Document Type

Thesis

Student Type

Graduate

Degree Name

Mechanical Engineering (MS)

Department, Program, or Center

Mechanical Engineering (KGCOE)

Advisor

Satish G. Kandlikar

Advisor/Committee Member

Robert Stevens

Advisor/Committee Member

Alfonso Fuentes-Aznar

Campus

RIT – Main Campus

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