Measuring temperature of the ice surface during its formation by using infrared instrumentation

Karev, Anatolij R.; Farzaneh, M.; Kollár, László

doi:10.1016/j.ijheatmasstransfer.2006.07.015

Cited by 19 publications

(7 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Karev et al () measured the spatial distribution of the surface temperature of a non‐rotating icing cylindrical rod simulating a riming hailstone in the laboratory using a remote infrared camera and experimentally confirmed the model predictions of Lozowski et al (). They showed that, even with a wet regime near the stagnation line, the outer regions of the cylindrical hailstone remained in dry growth.…”

Section: Resultsmentioning

confidence: 60%

“…When ice crystals impact on such a surface they have an increased chance of rebounding off the captured layer of ice crystals on the hail surface. Furthermore, it is interesting to note that, during wet growth, Karev et al () observed that the dry poles of the hailstone showed the presence of white rime feathers. It has been suggested that a possible charge separation mechanism when ice crystals interact with a graupel particle is the break‐up of tiny ice structures on the surface (Avila and Caranti, ).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The interaction of ice crystals with hailstones in wet growth and its possible role in thunderstorm electrification

Jayaratne

Saunders

2016

Quart J Royal Meteoro Soc

View full text Add to dashboard Cite

Charge separation during rebounding collisions of ice crystals on hail particles is a probable mechanism of thunderstorm electrification. Modelling of laboratory results successfully predicts the charge structure in thunderclouds under most conditions. An exception is the intense positive ground flashes observed in mid-continental severe storms which contain large hailstones that are generally in wet growth. It is difficult to see how interacting ice crystals may separate from the wet surface of a hailstone without sticking, although some studies have reported charge separation during this process. Our laboratory experiments show that, during ice crystal interactions with a simulated hailstone in wet growth, a small but significant charge transfer occurs during ice crystal interactions. We present evidence to show that the hailstone surface is not uniformly wet and consists of dry zones, particularly at the edges, where ice crystals are most likely to impact, and hypothesize that a small number of ice crystals rebounding off these zones may give rise to the observed charging current. While this may explain wet growth charging in laboratory experiments, we cannot directly extend the findings to natural thunderstorms where hailstones tend to rotate and gyrate as they fall, but they may experience different growth regimes within the cloud.

show abstract

Section: Resultsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 99%

The interaction of ice crystals with hailstones in wet growth and its possible role in thunderstorm electrification

Jayaratne

Saunders

2016

Quart J Royal Meteoro Soc

View full text Add to dashboard Cite

show abstract

“…Thermal images were corrected for emissivity, air temperature, and relative humidity. We assumed a uniform local emissivity of 0.96 based on emissivity values of water for smooth ice [Karev et al, 2007;Lingen et al, 2003]. Relative temperatures were systematically computed at different elevations (Z) at 8 cm intervals, using the spotmeter tool in the software ThermaCAM Research Professional 2.10 ( Figure 1d).…”

Section: Methodsmentioning

confidence: 99%

Toward quantifying discrete groundwater discharge from frozen seepage faces using thermal infrared images

Pandey

Gleeson

Baraër

2013

Geophysical Research Letters

View full text Add to dashboard Cite

[1] Frozen groundwater seeps from discrete features, such as fractures and faults, are common along steep faces of cliffs, mines, quarries, and road cuts in cold environments at high elevations and latitudes. Our objective is to test whether thermal infrared imaging can be used to quantify groundwater discharge from such discrete features in freezing conditions. Discrete seeps and freezing cliff faces were simulated in a cold room laboratory with a systematic series of experiments captured through infrared imaging. Two zones of distinct surface temperatures were observed at the ice surface: a zone of relatively warm and constant surface temperature above a zone with high thermal gradients. Experimental conditions impacted the length of the relative warm zone. A strong correlation is observed between length of the relative warm zone and the discharge rate suggesting that groundwater discharge from discrete features could be quantified using noninvasive infrared imaging. Citation: Pandey, P., T. Gleeson, and M. Baraer (2013), Toward quantifying discrete groundwater discharge from frozen seepage faces using thermal infrared images,

show abstract

“…At this period, the surface is under a runback icing condition, which means a water-ice mixed state, and the temperature of such condition is set at 273.15 K (the freezing point) in the thermodynamic model during simulation. The possible reasons for the temperature difference between experiment and simulation are as follows: (1) The supercooled water film runback phenomenon, which is observed in the experiments [26][27][28], has not been considered in the present model. In simulation, the temperature of the runback water film would not be lower than the freezing point temperature (273.15 K).…”

Section: International Journal Of Aerospace Engineeringmentioning

confidence: 99%

Numerical Simulation of Unsteady Conjugate Heat Transfer of Electrothermal Deicing Process

Lin

Shen

et al. 2018

International Journal of Aerospace Engineering

View full text Add to dashboard Cite

A novel 3-D unsteady model of in-flight electrothermal deicing process is presented in this paper to simulate the conjugate mass and heat transfer phenomena of water film runback, phase change, and solid heat conduction. Mathematical models of water film runback and phase change are established and solved by means of a loosely coupled method. At the current time step, solid heat conduction, water film runback, and phase change are iteratively solved until the heat boundary condition reaches convergence, then the temperature distribution and ice shape at the moment are obtained, and the calculation of the next time step begins subsequently. A deicing process is numerically simulated using the present model following an icing tunnel experiment, and the results match well with those in the literatures, which validate the present model. Then, an in-flight deicing process is numerically studied to analyze the effect of heating sequence.

show abstract

Measuring temperature of the ice surface during its formation by using infrared instrumentation

Cited by 19 publications

References 22 publications

The interaction of ice crystals with hailstones in wet growth and its possible role in thunderstorm electrification

The interaction of ice crystals with hailstones in wet growth and its possible role in thunderstorm electrification

Toward quantifying discrete groundwater discharge from frozen seepage faces using thermal infrared images

Numerical Simulation of Unsteady Conjugate Heat Transfer of Electrothermal Deicing Process

Contact Info

Product

Resources

About