English
norskBlar i forfatter Artikler, rapporter og annet (industriell teknologi) "Mughal, Umair Najeeb"
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Atmospheric ice accretion on non rotating vertical circular cyliner
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-10-22)Study of atmospheric ice accretion on a non-rotating vertical circular cylindrical object was carried out at dry and wet ice conditions. Both numerical and experimental techniques were used during this study. 3D numerical study was carried out using computational fluid dynamics based approach, whereas experimental study was carried out at Cryospheric Environmental Simulator ‘CES’ in Shinjo, Japan. ... -
Atmospheric Icing Sensors - Capacitive Techniques
(Peer reviewed; Journal article; Tidsskriftsartikkel, 2013-01-22)The application of capacitive sensing technique is widely distributed in different physical domains primarily because of the diversity in dielectric permittivity and due to its minimum loading error and inertial effects. Atmospheric ice is a complex mixture of water, ice and air which is reflected in its complex dielectric constant. There are many existing atmospheric icing sensors but only few are ... -
A case study to estimate thermal conductivity of ABS in Cold Climate Chamber
(Journal article; Peer reviewed; Tidsskriftartikkel, 2015-10-22)Non steady state thermal conductivity of ABS was estimated using an analytical approach in a Cold Climate Chamber at ?10?C and ?14?C. Two hollow cylinders of ABS of varying thickness were used to estimate the conductivity. The material was porous but the porosity was unknown. This paper is a case study to understand, if it is reasonable to estimate the thermal conductivity using the analytical varying ... -
Charge Transfer Scheme for Atmospheric Ice Sensing
(Peer reviewed; Journal article; Tidsskriftsartikkel, 2015-01-31)The atmospheric icing parameters are being measured nowadays with the aid of more customized yet limited commercial equipment. The parameters include atmospheric ice detection, icing load and icing rate. The robustness of such equipment is usually under scrutiny when it comes to cold/harsh environment operations. This phenomenon was experienced consistently by the atmospheric Icing Research Team at ... -
Encapsulated Water Hammer: Theoretical/Experimental Study
(Journal article; Tidsskriftartikkel; Peer reviewed, 2015-10-22)Water hammer phenomenon involves the transformation of kinetic energy in pressure energy, this transformation occurs as the fluid conditions change inside the pipe in quite a short time. Industry requires to affront frequent flow interruptions in pipe systems due to the closing of valves or stopping of pumping equipment. This phenomenon can initiate serious damages like destruction of the pipe system ... -
Experimental validation of icing rate using rotational load
(Peer reviewed; Journal article; Tidsskriftsartikkel, 2016-04-16)Icing load and icing rate are necessary feedback variables for an intelligent anti/de-icing systemtowork effectively in harsh cold environment of high north. These parametersmay be measured by axial loadings or by rotational loadings, as a function of current demand. However the former may not necessarily be dynamic, whereas the later necessarily be rotational. Sufficiently at a fixed rpm, a ... -
Multiphysics Based Design Study of an Atmospheric Icing Sensor
(Peer reviewed; Journal article; Tidsskriftsartikkel, 2016)A design study of an atmospheric icing sensor is presented in this article. The proposed design of the sensor is aimed to detect an atmospheric icing event, to determine ice type as well as to measure icing load, icing rate and melting rate. This sensor is constantly slowly rotating cylinder with four fins which measure atmospheric icing load and icing rate using rotational load measurement technique. ... -
Multiphysics based Numerical Study of Atmospheric Ice Accretion on a Full Scale Horizontal Axis Wind Turbine Blade
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-08)Atmospheric icing on wind turbines have been recognized as a hindrance to the development of the wind power in cold regions, where uncertainty surrounding the effects of icing on energy production may prevent otherwise good wind resources from being utilized. This research paper is focused on to numerically simulate the rate and shape of atmospheric ice accretion on a full-scale horizontal axis ... -
Mutual Charge Transfer for Estimating Salinity Ratio for Offshore Icing Sensors
(Peer reviewed; Journal article; Tidsskriftsartikkel, 2015-11-30)For offshore measurements in Cold Regions, salinity of ice is also a critical parameter (together with many other parameters such as icing type, load, icing rate and melting rate) to be identified in order to optimize the performance of anti/de icing systems. Although there are some available sensory solutions in the market to measure real time salinity levels of water, however there are still ... -
Numerical study of atmospheric ice accretion on rotating geometric cross sections with fins
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-05-12)This paper describes the numerical study of atmospheric ice accretion on rotating geometric cross sections, circular, hexagon and square , all having fins, to select an optimum geometric cross section for use as a rotating part of a newly- proposed designed icing sensor. Computational fluid dynamics-based numerical analyses were carried out in this research work to understand and analyse the ... -
State of the Art Review of Atmospheric Icing Sensors
(Journal article; Peer reviewed; Tidsskriftartikkel, 2016-03-31)A state of the art review of atmospheric icing sensors is presented in this article, in order to understand their design and working principle for future developments. It is found that most atmospheric icing sensors which are capable of delivering maximum information are based upon direct measurement of the physical properties (electrical or mechanical) of atmospheric ice. Some field measurements ... -
To Measure Relative Permittivity of Atmospheric Ice Using Frequency Sweep
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-10-31)The use of AD59333 IC for detecting atmospheric ice and atmospheric ice type was evaluated in this article. A prototype circuit was developed and was tested using a frequency sweep from 40 Hz to 20 kHz. The IC was calibrated using 100 kΩ resistor. The real and imaginary components of discrete Fourier transform were recorded at each frequency increment in order calculate the gain factor at each ... -
Torque and Axial Loading Physics for Measuring Atmospheric Icing Load and Icing Rate
(Peer reviewed; Journal article; Tidsskriftsartikkel, 2015-01-31)Measuring icing load and icing rate are important parameters for an atmospheric icing sensor. A new icing sensor has recently been designed and developed at Narvik University College for measuring atmospheric icing rate, icing load and icing type. Unlike the existing atmospheric icing sensors commercially available in market, which uses the axial loading for measuring icing load and icing rate, this ... -
Using Mutual Charge Scheme to Measure Salinity of Ice
(Journal article; Peer reviewed; Tidsskriftartikkel, 2015)For offshore measurements in Cold Regions, salinity of ice is also a critical parameter (together with many other parameterssuchasicingtype,load,icingrateandmeltingrate)to be identified in order to optimize the performance of anti/de icing systems. Although there are some available sensory solutions in the market to measure real time salinity levels of water, however there are still not many real ...
