Relevant bibliographies by topics / Surface freezing

Academic literature on the topic 'Surface freezing'

Author: Grafiati
Published: 4 June 2021
Last updated: 28 January 2023

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Journal articles on the topic "Surface freezing"

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Stallbaumer-Cyr, Emily M., Melanie M. Derby, and Amy R. Betz. "Physical mechanisms for delaying condensation freezing on grooved and sintered wicking surfaces." Applied Physics Letters 121, no. 7 (August 15, 2022): 071601. http://dx.doi.org/10.1063/5.0105412.

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Heat pipes are passive heat transfer devices crucial for systems on spacecraft; however, they can freeze when exposed to extreme cold temperatures. The research on freezing mechanisms on wicked surfaces, such as those found in heat pipes, is limited. Surface characteristics, including surface topography, have been found to impact freezing. This work investigates freezing mechanisms on wicks during condensation freezing. Experiments were conducted in an environmental chamber at 22 °C and 60% relative humidity on three types of surfaces (i.e., plain copper, sintered heat pipe wicks, and grooved heat pipe wicks). The plain copper surface tended to freeze via ice bridging—consistent with other literature—before the grooved and sintered wicks at an average freezing time of 4.6 min with an average droplet diameter of 141.9 ± 58.1 μm at freezing. The grooved surface also froze via ice bridging but required, on average, almost double the length of time the plain copper surface took to freeze, 8.3 min with an average droplet diameter of 60.5 ± 27.9 μm at freezing. Bridges could not form between grooves, so initial freezing for each groove was stochastic. The sintered wick's surface could not propagate solely by ice bridging due to its topography, but also employed stochastic freezing and cascade freezing, which prompted more varied freezing times and an average of 10.9 min with an average droplet diameter of 97.4 ± 32.9 μm at freezing. The topography of the wicked surfaces influenced the location of droplet nucleation and, therefore, the ability for the droplet-to-droplet interaction during the freezing process.
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MAEDA, NOBUO, and VASSILI V. YAMINSKY. "EXPERIMENTAL OBSERVATIONS OF SURFACE FREEZING." International Journal of Modern Physics B 15, no. 23 (September 20, 2001): 3055–77. http://dx.doi.org/10.1142/s0217979201007051.

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Capillary phase transitions and those induced by interfaces, like pre-melting, have been studied for decades. The related phenomenon of surface freezing has not been explored so extensively. We review experiments on surface freezing, those of long-chain n-alkanes in particular, and place the results within the wider thermodynamic framework of surface phase transitions. Surface freezing plays an important role in nucleation and crystallization of bulk long-chain n-alkanes. Implications for capillary melting and freezing of substances at nanoscales are discussed. Theoretical aspects of condensed capillary phase transitions will be reviewed separately.
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Motoyoshi, I. "Temporal freezing of surface properties." Journal of Vision 6, no. 6 (March 18, 2010): 124. http://dx.doi.org/10.1167/6.6.124.

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Heni, Martin, and Hartmut Löwen. "Surface Freezing on Patterned Substrates." Physical Review Letters 85, no. 17 (October 23, 2000): 3668–71. http://dx.doi.org/10.1103/physrevlett.85.3668.

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Baillie, C. F., and D. A. Johnston. "Freezing a fluid random surface." Physical Review D 48, no. 10 (November 15, 1993): 5025–28. http://dx.doi.org/10.1103/physrevd.48.5025.

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Gang, O., B. M. Ocko, X. Z. Wu, E. B. Sirota, and M. Deutsch. "Surface freezing in chain molecules." Synchrotron Radiation News 12, no. 2 (March 1999): 34–40. http://dx.doi.org/10.1080/08940889908260986.

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Wang, Zhongyi, Zhiwei Deng, Yanhua Wang, and Yi Yi. "Simulation Study on the Factors Affecting the Solidification of Liquid Droplets with Different Salinity on Cold Surfaces." Applied Sciences 13, no. 2 (January 11, 2023): 994. http://dx.doi.org/10.3390/app13020994.

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Salt spray splashing on the structural surfaces of ships is a common difficulty in polar navigation. In this paper, experiments are designed to study the variation in the growth peak of pure water droplets on the surface of a hydrophobic coating with a contact angle of 90°, and the numerical simulation method is verified according to the experiment. The variation in the growth peak calculated by the numerical simulation is consistent with the experiment, and the calculation error of the freezing time obtained by numerical simulation is less than 10% of that of the experiment. The freezing processes of droplets with salinity levels of 0, 10, 20, 30, 40, and 10 μL on the surfaces of the hydrophilic, hydrophobic, and super hydrophobic plates are studied. The freezing time of the droplets is calculated, along with the effects of the wall temperature, surface contact angle, and salinity on the freezing time and freezing process of the droplets. The results show that the freezing time increased dramatically with increasing salinity. The influence of the contact angle and substrate temperature on the freezing process was also concentrated. All these results contribute to a better understanding of the icing mechanism on marine surfaces.
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Loganina, About the author: Valentina I. "Research of freezing kinetics of water drop on superhydrophobic coating surfaces." Vestnik MGSU, no. 4 (April 2019): 435–41. http://dx.doi.org/10.22227/1997-0935.2019.4.435-441.

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Introduction. Anti-icing coatings are used to prevent icing of the building roofs and power transmission line poles. One of the characteristics of anti-icing properties of superhydrophobic surfaces is the delay in the crystallization of drops on such surfaces. A significant delay in the crystallization of water drops on superhydrophobic substrates is noted in the scientific and technical literature. However, it is recorded in a number of papers that the delay time of crystallization on hydrophilic substrates is longer than the corresponding values on superhydrophobic surfaces. In connection with the foregoing, the study of the freezing kinetics of a water drop on a superhydrophobic surface in order to assess its efficiency is a relevant scientific and technical problem. Materials and methods. To evaluate the kinetics of freezing a of water drop on a superhydrophobic surface, the following experiment is conducted. A drop of water is placed on the superhydrophobic surface of the mortar substrate, which is placed in a freezer at a temperature of –18 °C. Studies of the drop freezing dynamics on the surface are performed using a Testo 875-1 thermal imager. To create a superhydrophobic surface, an aerosil R 972 with density ρ = 2360 kg/m3, particle size of 16 nm and specific surface area Ssp = 12 000 m2/kg is used as a filler. A silicone resin SILRES® MSE 100 of 10 % concentration is used as a binder. The obtained solutions are deposited on the mortar substrates. The degree of hydrophobicity is assessed by the magnitude of the wetting angle (θ°). Results. Results of the studies of temperature distribution on the water drop surface indicate that the distribution is uneven. The process of drop freezing is multistage. In the initial period, there is a transfer of heat from the surface into the water drop. This stage is followed by the process of drop freezing which is manifested in the upward movement of the freezing front from the substrate. Conclusions. It is revealed that the temperature distribution on the surface of a water drop is uneven. When freezing, a water drop has a pointed top.
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Campañone, Laura A., Viviana O. Salvadori, and Rodolfo H. Mascheroni. "Food freezing with simultaneous surface dehydration: approximate prediction of freezing time." International Journal of Heat and Mass Transfer 48, no. 6 (March 2005): 1205–13. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2004.09.030.

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Modak, Viraj P., Barbara E. Wyslouzil, and Sherwin J. Singer. "Mechanism of surface freezing of alkanes." Journal of Chemical Physics 153, no. 22 (December 14, 2020): 224501. http://dx.doi.org/10.1063/5.0031761.

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Dissertations / Theses on the topic "Surface freezing"

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Swanson, Brian D. "Surface freezing and surface induced ordering in liquid crystal films /." Thesis, Connect to this title online; UW restricted, 1992. http://hdl.handle.net/1773/9678.

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Thesis (Ph. D.)--University of Washington, 1992.
Vita. Accompanying video is in VHS Format and contains illustrations of observations described in chapter 2. Includes bibliographical references (leaves [222]-232).
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Ash, Philip Andrew. "Surface freezing in surfactant/alkane/water systems." Thesis, Durham University, 2011. http://etheses.dur.ac.uk/843/.

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Surface freezing transitions in mixed monolayers of a homologous series of cationic surfactants, the alkyltrimethyl ammonium bromides (CnTAB where n = 12, 14, 16, 18), as well as a range of non-ionic, zwitterionic and biological surfactants, have been investigated ellipsometrically with a range of n-alkanes (Cm where m = 12 – 20, 28). Two distinct solid phases are observed depending upon the chain length difference between surfactant and n-alkane. Type I solid phases consist of a surface frozen mixed monolayer and are formed when this difference is small. Type II solid phases are bilayer structures with a frozen layer of neat n-alkane above a liquid-like mixed monolayer. Type II freezing was thought to occur via wetting of surface frozen n-alkane, as previously reported type II transitions took place in the presence of surface frozen n-alkanes. Thermodynamically stable type II solid phases have now been found in the presence of n-alkanes that do not show surface freezing at the air/alkane interface, however, and so this picture is incomplete. In the presence of pentadecane, for example, the biological surfactant lyso-OPC forms a stable type II solid phase 6.5 °C above the n-alkane bulk melting point. Such a large surface freezing range is unprecedented for a type II system. Studies using external reflection FTIR (ER-FTIRS) and vibrational sum-frequency spectroscopies (VSFS) have been used to probe these novel behaviours. Results were fully consistent with the proposed structures of both type I and type II surface frozen layers. 2D correlation analysis of ER-FTIR spectra as a function of temperature showed that type II frozen layer formation does not proceed via a simple wetting transition, with the formation of a transient intermediate implied. Evidence for such an intermediate was provided by dynamic ellipsometry measurements on the type II C18TAB/n-eicosane system.
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Modak, Viraj Prakash. "Surface Freezing in n-Alkanes: Experimental and Molecular Dynamics Studies." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449013699.

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Clark, Robin Tristan. "The integration of cloud satellite images with prediction of icy conditions on Devon's roads." Thesis, University of Plymouth, 1997. http://hdl.handle.net/10026.1/1844.

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The need for improved cloud parameterisations in a road surface temperature model is demonstrated. Case studies from early 1994 are used to investigate methods of tracking cloud cover using satellite imagery and upper level geostrophic flow. Two of these studies are included in this thesis. Errors encountered in cloud tracking methods were investigated as well as relationships between cloud height and pixel brightness in satellite imagery. For the first time, a one dimensional energy balance model is developed to investigate the effects of erroneous cloud forecasts on surface temperature. The model is used to determine detailed dependency of surface freezing onset time and minimum temperature on cloud cover. Case studies from the 1995/96 winter in Devon are undertaken to determine effects of differing scenarios of cloud cover change. From each study, an algorithm for predicting road surface temperature is constructed which could be used in future occurrences of the corresponding scenario of the case study. Emphasis is strongly placed on accuracy of predictions of surface freezing onset time and minimum surface temperature. The role o f surface and upper level geostrophic flow, humidity and surface wetness in temperature prediction is also investigated. In selected case studies, mesoscale data are also analysed and compared with observations to determine feasibility of using mesoscale models to predict air temperature. Finally, the algorithms constructed from the 1995/96 studies are tested using case studies from the 1996/97 winter. This winter was significantly different from its preceding one which consequently meant that the algorithm from only one scenario of the 1995/96 winter could be tested. An algorithm is also constructed from a 1996/97 winter case study involving a completely different scenario Recommendations for future research suggest testing of existing algorithms with guidance on additional scenarios.
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Bhola, Rabindra. "Impact and freezing of molten tin droplets on a solid surface." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ28862.pdf.

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Prasad, Shishir. "MOLECULAR STUDY OF THE SURFACE FREEZING PHENOMENON IN MATERIALS CONTAINING LONG ALKYL CHAINS." University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1191522340.

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Maeda, Nobuo, and nobuo@engineering ucsb edu. "Phase Transitions of Long-Chain N-Alkanes at Interfaces." The Australian National University. Research School of Physical Sciences and Engineering, 2001. http://thesis.anu.edu.au./public/adt-ANU20011203.151921.

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An experimental study of phase transitions of long-chain n-alkanes induced by the effect of interfaces is described. ¶ The phase behaviour of long-chain n-alkanes (carbon number 14, 16, 17, 18) adsorbed at isolated mica surfaces and confined between two mica surfaces has been studied in the vicinity of and down to several degrees below the bulk melting points, Tm. Using the Surface Force Apparatus we have measured the thickness of alkane films adsorbed from vapour (0.97 [equal to or greater-than] p/p[subscript o] [equal to or greater-than] 0.997), studied capillary condensation transition, subsequent growth of capillary condensates between two surfaces, and phase transitions in both the adsorbed films and the condensates. By measuring the growth rate of the capillary condensates we have identified a transition in the lateral mobility of molecules in the adsorbed films on isolated mica surfaces. This transition to greater mobility occurs slightly above Tm for n-hexadecane, n-heptadecane and n-octadecane but several degrees below Tm for n-tetradecane, and is accompanied by a change in wetting behaviour and a measurable decrease in adsorbed film thickness for n-heptadecane and n-octadecane. Capillary condensates that form below Tm remain liquid, but may freeze if the degree of confinement is reduced by separation of the mica surfaces. An increase in the area of the liquid-vapour interface relative to that of the liquid-mica interface facilitates freezing in the case of the long-chain alkanes, which show surface freezing at the liquid-vapour interface. ¶ Although thermodynamic properties of the surface freezing transition have been rather well documented, the kinetics involved in formation of such ordered monolayers has so far received very little attention. We studied the surface tension of n-octadecane as a function of temperature in the vicinity of Tm, using the static Wilhelmy plate and the dynamic maximum bubble pressure methods. The two methods give different results on cooling paths, where nucleation of the surface ordered phase is involved, but agree on heating paths, where both methods measure properties of the equilibrium surface phase. On cooling paths, the surface of bubbles may supercool below the equilibrium surface freezing temperature. The onset of surface freezing is marked by a sharp drop in the surface tension. The transition is accompanied by an increased stability of the films resulting in longer bubble lifetimes at the liquid surface, which suggests that the mechanical properties of the surfaces change from liquid-like to solid-like. Our results suggest occurrence of supercooling of the monolayer itself.
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Brennvall, Jon Eirik. "New techniques for measuring thermal properties and surface heat transfer applied to food freezing." Doctoral thesis, Norwegian University of Science and Technology, Department of Energy and Process Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-979.

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This thesis presents two different works. The first part introduces a thermal multimeter which measures heat capacity, thermal conductivity and density. The instrument gives continuous measurement data within a temperature range. With some exceptions this also holds for the prototype of a thermal multimeter which is built and tested. The measuring method is constant heating of one side of a slab. The slab is insulated on all other sides. After some time there will be equilibrium where there is a constant temperature difference over the slab. The thermal conductivity can be calculated from this temperature difference. The heat capacity can be calculated from how fast the temperature rises. Measurements of the slab thickness give density as function of temperature.

The second part discusses a practical method for measuring the heat transfer coefficient (α). The method is based on shell freezing of clear jelly which has the same shape as the product of interest. Transparent jelly is transparent before it freezes and white when frozen. If the sample is removed from the freezer and cut through before it is completely frozen thefreezing front is distinct and the thickness of the frozen layer can be measured. By measuring time the jelly sample was in the freezer and thicknessof the frozen layer the heat transfer coefficient can be calculated by using Plank's equation. The method is suitable for measuring local α because it can be shown that tangential heat flow can be neglected when the frozen layer is thin.

Computer simulations, automated data acquisition and data processing are a considerable part of this thesis, even though it is not obvious from the results presented. There are more lines in the data code written to obtain the results presented here then the number of lines in this thesis. The size of selected simulation results and processed data from the measurements are 6.3 GB.


Attachments can be downloaded from http://www.ub.ntnu.no/dravh/Brennvall_attachment.zip (1,33 GB)
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Großberger, Sandra [Verfasser], and Geoffrey [Gutachter] Lee. "Tortuous membranes produced by vacuum-induced surface directional freezing / Sandra Großberger ; Gutachter: Geoffrey Lee." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2017. http://d-nb.info/1130869555/34.

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Venkatasamy, Vasanth Kumar. "Analysis of in-cavity thermal and pressure characteristics in aluminum alloy die casting." Connect to this title online, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1100721824.

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Books on the topic "Surface freezing"

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Bhola, Rabindra. Impact and freezing of molten tin droplets on a solid surface. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1999.

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Olsen, W. Experimental evidence for modifying the current physical model for ice accretion on aircraft surfaces. [Washington, DC]: National Aeronautics and Space Administration, 1986.

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Center, Langley Research, ed. Preliminary experiments on surface flow visualization in the cryogenic wind tunnel by use of condensing or freezing gases. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1988.

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Microfabricated ice-detection sensor. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Microfabricated ice-detection sensor. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Mehran, Mehregany, Roy Shuvo, and United States. National Aeronautics and Space Administration., eds. Microfabricated ice-detection sensor. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Mehran, Mehregany, Roy Shuvo, and United States. National Aeronautics and Space Administration., eds. Microfabricated ice-detection sensor. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Bell, Graham. Full Fathom 5000. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780197541579.001.0001.

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This book is about a voyage which began the systematic exploration of the deep sea. Between 1873 and 1876, HMS Challenger sailed around the world and collected animals living a mile or more below the surface of the ocean. Conditions at these depths are unlike those anywhere else on Earth: crushing pressure, freezing cold and perpetual darkness. The animals that live there are equally extraordinary, but hardly any had ever been seen before. The Challenger expedition was a landmark in the history of science because it added a whole new fauna to the diversity of life, besides mapping the physical properties of the world ocean for the first time. The opening sections of the book set out how this extraordinary voyage was first conceived and planned. The middle sections follow the track of the voyage itself and describe the strange and hitherto unknown animals that the ship hauled up from the sea floor. It also describes the scientists and sailors who made the voyage, and how they contributed in different ways to its success. The closing sections deal with the varying fates of these men, and how the specimens they collected became the basis of our current knowledge of life in the deep sea.
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Book chapters on the topic "Surface freezing"

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Bowles, Richard K., and Eduardo Mendez-Villuendas. "Surface Nucleation in Freezing Nanoparticles." In Nucleation and Atmospheric Aerosols, 339–43. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6475-3_69.

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Faubel, Manfred. "Liquid Micro Jet Studies of the Vacuum Surface of Water and of Chemical Solutions by Molecular Beams and by Soft X-Ray Photoelectron Spectroscopy." In Molecular Beams in Physics and Chemistry, 597–630. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63963-1_26.

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AbstractLiquid water, with a vapor pressure of 6.1 mbar at freezing point, is rapidly evaporating in high vacuum, rapidly cooling off by the evaporative cooling, and is freezing to ice almost instantly. Nevertheless, liquid water free vacuum surfaces can be prepared for short instances when injecting very small, fast flowing, liquid jets into high vacuum. They provide perfectly suited targets for molecular beams analysis of molecular evaporation of monomers and dimers from liquids. Also, the microjet technology allows ultrahigh vacuum studies of atomic scale liquid surface composition and electronic structures, as will be demonstrated by using highly focused Synchrotron radiation for EUV/XUV-photoelectron spectrocopy on a wide range of chemical solutions.
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Davis, Heidi L., Thomas L. Beck, Paul A. Braier, and R. Stephen Berry. "Time Scale Considerations in the Characterization of Melting and Freezing in Microclusters." In The Time Domain in Surface and Structural Dynamics, 535–49. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2929-6_29.

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Gavrilov, Timmo, Gennady Kolesnikov, and Tatiana Stankevich. "Influence of Temperature and Soil Thermal Expansion on Cracking of Dirt Road Surface During Seasonal Freezing." In VIII International Scientific Siberian Transport Forum, 268–76. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37919-3_26.

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Schneider, Stephen H., Starley L. Thompson, and Eric J. Barron. "Mid-Cretaceous Continental Surface Temperatures: Are High CO2 Concentrations Needed to Simulate Above-Freezing Winter Conditions?" In The Carbon Cycle and Atmospheric CO2 : Natural Variations Archean to Present, 554–59. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm032p0554.

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Asfour, S., F. Bernardin, C. Mauduit, E. Toussaint, and J. M. Piau. "Hydrothermal Study of Roads with De-freezing Surface, Obtained by the Circulation of a Warm Fluid in a Bonding Porous Asphalt Layer." In RILEM Bookseries, 545–56. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-7342-3_44.

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Har-Shai, Yaron, and Lior Har-Shai. "Minimally Invasive Technologies for the Treatment of Hypertrophic Scars and Keloids: Intralesional Cryosurgery." In Textbook on Scar Management, 235–41. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44766-3_28.

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AbstractA novel intralesional cryosurgical needle is inserted into the hypertrophic scars and keloid (HSK). It is connected to a canister of liquid nitrogen, which causes the cryoprobe to freeze, thereby freezing the HSK from inside out.Following the cryo-treatment, the histomorphometric analysis demonstrated rejuvenation of the treated scar. The frozen tissue was devoid of proliferating cells and of mast cells whereas the number of blood vessels remained unaltered.The surface thermal history showed slow cooling and thawing rates as well as less pronounced end temperature, which is “friendly” to the melanocytes, thus only minimal hypopigmentation was evident. A significant long hold time was documented. This allows time for solute effects, ice crystal formation, and recrystallization, which enhances and increases the rate of cell death. This long hold time is unique for the intralesional cryosurgery technology and might explain the superior clinical results.More than 50% of scar volume reduction was achieved following a single cryotherapy. For ear HSK, 70% of volume reduction was achieved, and for the upper back and shoulders 60%. Significant alleviation of objective and subjective clinical symptoms was documented. During the follow-up period there was no worsening or infection of the HSK and only minimal hypopigmentation.A pain control protocol was applied, which significantly reduced pain severity during and after the cryosurgery treatment to tolerable levels (VAS ≤ 3).The intralesional cryosurgery treatment is an evidence-based, effective, and safe technology, simple to operate, can be applied as an office procedure, is cost-effective, and takes a short learning curve. The technique achieves remarkable clinical results usually by a single treatment.
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Chu, Fuqiang. "Dynamic Melting of Freezing Droplets on Superhydrophobic Surfaces." In Springer Theses, 89–103. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8493-0_5.

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Basu, Rahul. "Sublimation and Self Freezing of Planar Surfaces in Rarefied Atmospheres." In TMS 2018 147th Annual Meeting & Exhibition Supplemental Proceedings, 811–20. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72526-0_77.

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Greenbaum, A., Alexander A. Puzenko, M. Vasilyeva, and Yu Feldman. "State of Water in Confinement near Hydrophilic Surfaces Below the Freezing Temperature." In NATO Science for Peace and Security Series B: Physics and Biophysics, 69–77. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5012-8_5.

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Conference papers on the topic "Surface freezing"

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Modak, Viraj, Harshad Pathak, Mitchell Thayer, Sherwin Singer, and Barbara Wyslouzil. "Surface freezing of n-octane nanodroplets." In NUCLEATION AND ATMOSPHERIC AEROSOLS: 19th International Conference. AIP, 2013. http://dx.doi.org/10.1063/1.4803210.

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Fang, Guoping, Yadollah Maham, and Alidad Amirfazli. "Understanding the Role of Surface Micro-Texture on the Delayed Freezing of Drops on Cold Surfaces." In ASME 2011 9th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2011. http://dx.doi.org/10.1115/icnmm2011-58188.

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Freezing of drops on surfaces has many consequences in icing of various systems, e.g. micro-condensers. It is known that when a water drop is placed on a cold surface and the surface temperature is reduced, it will not necessarily freeze when the surface temperature has reached zero degrees Celsius. The delay in freezing of a drop on a cold surface is not well understood; especially the effect that micro- and nano-texture of a surface has this delay. In this study, freezing and melting points of water drops on various micro-textured surfaces, i.e. superhydrophilic, and superhydrophobic have been measured by differential scanning calorimetry (DSC). A comparison of the experimental results with smooth hydrophilic and hydrophobic surfaces allows us to understand the roles of surface chemistry and roughness in freezing of drops in contact with such surfaces. It is found that when the surface chemistry is hydrophobic, roughness will delay the freezing and a drop may not freeze until the surface temperature has been lower than −15 ° C. On the contrary, for hydrophilic surfaces, roughness will shorten the freezing delay and facilitate formation of ice on the surface. This can explain the benefit of the superhydrophobic surfaces (SHS) in preventing ice formation.
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Kuorsaki, Yasuo, and Isao Satoh. "FREEZING OF SUPERCOOLED WATER ON AN OSCILLATING SURFACE." In International Heat Transfer Conference 10. Connecticut: Begellhouse, 1994. http://dx.doi.org/10.1615/ihtc10.1610.

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Yao, Yina, Cong Li, Zhenxiang Tao, and Rui Yang. "Numerical Simulation of Water Droplet Freezing Process on Cold Surface." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71175.

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It is significant to clearly understand the freezing process of water droplets on a cold substrate for the prevention of ice accretion. In this study, a three-dimensional numerical model including an extended phase change method was developed on OpenFOAM platform to simulate the freezing of static water droplets on cooled solid substrates. The predicted freezing process was compared with numerical results obtained by others. Good agreements were obtained and our numerical model results in faster convergence compared to the traditional phase change method. The effects of surface wettability on freezing time and freezing velocity were numerically investigated. The results show that the freezing time presents a positive relationship with contact angle due to the smaller contact area with higher contact angle, which agrees well with the theoretical analysis. Besides, the empirical relation between freezing time and contact angle were obtained.
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Zhou, Jiawei, Xiangxiong Zhang, and Min Chen. "The Influence of Surface Electric Charge on Water Freezing." In The 15th International Heat Transfer Conference. Connecticut: Begellhouse, 2014. http://dx.doi.org/10.1615/ihtc15.nms.009625.

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Bohm, Rachel N., Amy Rachel Betz, and Edward Kinzel. "NANOSTRUCTURED SURFACE SIGNIFICANTLY ALTERS DROPLET DYNAMICS AND FREEZING BEHAVIOR." In Second Thermal and Fluids Engineering Conference. Connecticut: Begellhouse, 2017. http://dx.doi.org/10.1615/tfec2017.mnp.017968.

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Stallbaumer, Emily, Adan Cernas, Amy Betz, and Melanie Derby. "Ice Formation due to Condensation of Moist Air on Commercial Wicks." In ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icnmm2020-1088.

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Abstract Heat pipes are valuable heat transfer devices that can be used in space; however, when exposed to the extremely low temperature of space, the working fluid can freeze. Currently, there are different methods to help mitigate freezing effects, including non-condensable gas-charged heat pipes and understanding ice formation on surfaces (e.g., typically surfaces with hydrophobic coatings). However, there is limited research about ice formation on wicks. Different wicking structures may delay freezing or mitigate freezing effects. This paper will investigate ice formation on two surfaces — commercial sintered and grooved wicks. An indoor environmental chamber was used to control ambient air temperature (i.e., 22°C) and relative humidity (i.e., 60% RH) and a Peltier cooler was used to control the surface temperature (i.e., −5°C). The resulting condensation of water onto the surface and then freezing was recorded for an hour and analyzed for the time freezing began on the surface (i.e., ice is initially visible) and the time freezing was complete on the surface. Initial results indicate that the sintered wick begins to freeze first (on average at 10.73 minutes versus 13.66 for the grooved wick) and the freezing front propagates faster (taking on average 10.83 minutes versus 12.44 minutes for the grooved wick). From the analysis, it is seen that the wicking surface structure influences the initial freezing time and the rate the freezing front propagates across the surface. These differences and the causes are investigated in this paper. These differences can, in the future, be exploited to design an optimal freeze-tolerant heat pipe and heat pipe freezing models.
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Haque, Mohammad Rejaul, and Amy Rachel Betz. "Frost Formation on Aluminum and Hydrophobic Surfaces." In ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icnmm2018-7609.

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Ice and frost formation on the surfaces of car windshield, airplanes, air-conditioning duct, transportation, refrigeration and other structures is of great interest due to its negative impact in the efficiency and reliability of the system. Frost formation is a complex and fascinating phenomenon. Frequent defrosting are required to remove the ice that causes economic losses. In order to delay the freezing phenomenon, hydrophobic surfaces (Al-H) were prepared using a very simple and low cost method by dip coating of Aluminum in Teflon© and FC - 40 solution at a ratio of 2:10. Later, the samples were placed on a freezing stage in a computer controlled environmental chamber. The freezing stage was held at a constant temperature of 265 ± 0.5 K. The environmental temperature was set to 295 ± 0.5 K and the relative humidity (RH) was set to 40% and 60% respectively. The samples were observed via optical microscopy from the top and videos of the freezing dynamics were captured. The time required for the whole surface to freeze was named as ‘Freezing time’ and is determined by investigating the consecutive images. The inter-droplet freezing wave propagation was accelerated via a frozen droplet/area and then propagates through the surface very quickly. Ice bridging was also seen for the frost propagation. However, the maximum freezing front propagation velocity was found for Al surfaces at 60% RH. At 40% RH, the Al surface required approximately 10 ± 1 minutes to freeze while the Al-H surface delay freezing until 15 ± 1 minutes. This is due to a slow rate of nucleation and also increased rate of coalescence. At 60% RH, both surface froze faster than 40% RH. The Al surface required 6.5 ± 1 minutes and the Al-H surface froze after 10 ± 1 minutes. The change in freezing kinetics, freezing time, the size of droplets at freezing, and the surface area covered at freezing are all related to the rate of coalescence of droplets. Again, the added thermal resistance of the coating and less water-surface contact area of the droplet to the cooled hydrophobic surface inhibited the growth rate resulting the freezing delay.
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Hanawa, Y., Y. Sasaki, S. Uchida, T. Funayoshi, M. Otsuji, H. Takahashi, and A. Sakuma. "Thermomechanical Formulation of Freezing Point Depression Behavior of Liquid on Solid Surface With Nanostructure." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23759.

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Abstract In this study, we investigated the freezing point depression of liquids in nanostructures using a new thermomechanical method. First, we experimentally determined the freezing points of water, cyclohexane, and a certain organic material (Chem.A) in nanoscale structures using DSC measurements. Thereafter, we formulated a new equation by improving the Gibbs–Thomson equation, which is the conventional formula for representing the freezing point depression of a liquid in nanostructures. We introduced a new term in this new equation to represent the increase in the kinetic energy of the liquid molecule as a result of collision between the liquid molecules and nanostructure walls. Subsequently, we evaluated the solid–liquid interface free energy of sublimation materials by fitting the theoretical freezing point derived from the new equation to experimental data. In this study, we succeeded in reproducing the experimental data of freezing point depression using the proposed equation. In particular, the freezing points of cyclohexane and Chem.A in the nanostructure were better fitted by this new equation at 10 nm or more compared with the conventional equation. Our results show that the interaction between the wall of the nanostructure and liquid molecules affects freezing point depression.
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Kuras, O., M. Krautblatter, J. B. Murton, E. Haslam, P. I. Meldrum, P. B. Wilkinson, and S. S. Uhlemann. "Monitoring Rock-freezing Experiments in the Laboratory with Capacitive Resistivity Imaging." In Near Surface Geoscience 2012 – 18th European Meeting of Environmental and Engineering Geophysics. Netherlands: EAGE Publications BV, 2012. http://dx.doi.org/10.3997/2214-4609.20143312.

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Reports on the topic "Surface freezing"

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Asenath-Smith, Emily, Emily Jeng, Emma Ambrogi, Garrett Hoch, and Jason Olivier. Investigations into the ice crystallization and freezing properties of the antifreeze protein ApAFP752. Engineer Research and Development Center (U.S.), September 2022. http://dx.doi.org/10.21079/11681/45620.

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Antifreeze proteins (AFPs) allow biological organisms, including insects, fish, and plants, to survive in freezing temperatures. While in solution, AFPs impart cryoprotection by creating a thermal hysteresis (TH), imparting ice recrystallization inhibition (IRI), and providing dynamic ice shaping (DIS). To leverage these ice-modulating effects of AFPs in other scenarios, a range of icing assays were performed with AFPs to investigate how AFPs interact with ice formation when tethered to a surface. In this work, we studied ApAFP752, an AFP from the beetle Anatolica polita, and first investigated whether removing the fusion protein attached during protein expression would result in a difference in freezing behavior. We performed optical microscopy to examine ice-crystal shape, micro-structure, and the recrystallization behavior of frozen droplets of AFP solutions. We developed a surface chemistry approach to tether these proteins to glass surfaces and conducted droplet-freezing experiments to probe the interactions of these proteins with ice formed on those surfaces. In solution, ApAFP752 did not show any DIS or TH, but it did show IRI capabilities. In surface studies, the freezing of AFP droplets on clean glass surfaces showed no dependence on concentration, and the results from freezing water droplets on AFP-decorated surfaces were inconclusive.
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