Disputation: Umair Najeeb Mughal
Doctoral candidate Umair Najeeb Mughal at the Physics, Faculty of Mathematics and Natural Sciences, is defending the thesis
"Study of a novel atmospheric icing monitor"
for the degree of Philosophiae Doctor.
" A Review of New and Emerging Sensor Technologies for Flow, Pressure and Vibration"
Mr. Mughal have Bachelors in Aerospace, & Masters in Mechanical Engineering. He started his career as Assistant Prof. in NED University Pakistan. In 2010 he started working as a researcher in Nonlinear Controls at UPC Spain. In 2011 he joined Arctic University Norway as researcher. Today, he runs his own company Arctic-Experts.
Main research findings
A design study of an atmospheric icing monitor is conducted in this dissertation. ISO 12494 ‘an international standard on atmospheric icing of structures’, recommends to develop a slowly rotating atmospheric icing monitor. But, the standard has neither defined or described slow rotation, nor provided any reason for this recommendation. This research therefore finds that ‘slow rotation’ of an atmospheric icing monitor is “a rotational speed which is always less than the Stokes rotational speed and Macklin rotational speed, such that the viscous effects highly dominate the momentum effects and coalescence of droplets occur naturally, in the near vicinity of the stagnation point or in the impingement region”. The ‘slow rotation speed’ varies linearly with ambient flow parameters, and it varies inversely with geometric, size and shape parameters of the icing monitor and droplet. One main advantage of slow rotation is the slow movement of stagnation point, which would govern uniform ice density, closer to the natural conditions mentioned in standard. Using this description of ‘slow rotation’, a prototype monitor was designed, which was tested at Cryospheric Environmental Simulator, Japan. The monitor can be improved to be used for meteorological measurements, or to integrate it with an intelligent anti/de-icing system.
Atmospheric icing on rotating cylinder with four fins at t = 110min at cryospheric environmental simulator, Shinjo, Japan