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Journal of Testing and Evaluation, 2023
ABSTRACT Accidents induced by horizontal frost heave (HFH) occur frequently in foundation pits. Pit walls are unstable because of the deformation due to HFH. The effects of HFH have been ignored in the design and construction of foundation pits, and existing studies on the characteristics of HFH in foundation pits are limited. Therefore,
Xiaolin Zhao +7 more
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ABSTRACT Accidents induced by horizontal frost heave (HFH) occur frequently in foundation pits. Pit walls are unstable because of the deformation due to HFH. The effects of HFH have been ignored in the design and construction of foundation pits, and existing studies on the characteristics of HFH in foundation pits are limited. Therefore,
Xiaolin Zhao +7 more
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Applied Thermal Engineering, 2017
Abstract Frost frequently forms on refrigeration and cryogenic engineering systems. Frost on finned surfaces increases the air-side thermal resistance and reduces the airflow area, which consequently reduce the heat transfer rate. Structured fin surfaces may be an effective solution to delay frost formation and promote meltwater drainage.
Xiaomin Wu +3 more
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Abstract Frost frequently forms on refrigeration and cryogenic engineering systems. Frost on finned surfaces increases the air-side thermal resistance and reduces the airflow area, which consequently reduce the heat transfer rate. Structured fin surfaces may be an effective solution to delay frost formation and promote meltwater drainage.
Xiaomin Wu +3 more
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Aerodynamic characteristics of hoar frost roughness
AIAA Journal, 1992Boundary-layer measurements were carried out in the flow over six preserved samples of frost grown on aluminum plates exposed to the clear night sky. The objective of the work was to determine effective height and spacing characteristics of the frost.
R. J. Kind, M. A. Lawrysyn
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International Journal of Heat and Mass Transfer, 2013
Abstract The objective of this study is to investigate frost formation and growth in a spirally-coiled circular fin-tube heat exchanger. The frost thickness and growth rate were measured in the transverse and circumferential directions by varying the relative humidity (or humidity ratio), air flow rate, inlet air temperature, and fin pitch. The frost
Sang Hun Lee +3 more
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Abstract The objective of this study is to investigate frost formation and growth in a spirally-coiled circular fin-tube heat exchanger. The frost thickness and growth rate were measured in the transverse and circumferential directions by varying the relative humidity (or humidity ratio), air flow rate, inlet air temperature, and fin pitch. The frost
Sang Hun Lee +3 more
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International Journal of Heat and Mass Transfer, 2022
Abstract To better understand the frost growth characteristics of a tube-finned heat exchanger, a novel frosting model was developed based on its frosting distribution characteristics. The frosting model considered both the frost growth on the edge of windward fins and the uneven frost distribution on the surfaces of tube-finned segments. Compared to
Long Zhang +3 more
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Abstract To better understand the frost growth characteristics of a tube-finned heat exchanger, a novel frosting model was developed based on its frosting distribution characteristics. The frosting model considered both the frost growth on the edge of windward fins and the uneven frost distribution on the surfaces of tube-finned segments. Compared to
Long Zhang +3 more
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Thermofluid characteristics of frosted finned-tube heat exchangers
International Journal of Heat and Mass Transfer, 2005Abstract The performance of frosted finned-tube heat exchangers of different fin types is investigated by experiments in this paper. The effects of the air flow rate, the air relative humidity, the refrigerant temperature, and the fin type on the thermofluid characteristics of the heat exchangers are discussed.
Wei-Mon Yan, Hung-Yi Li, Yeong-Ley Tsay
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Frosting Characteristics on Hydrophilic and Superhydrophobic Copper Surfaces
Journal of Heat Transfer, 2016The main objective of this study is to examine the frosting characteristics affected by the surface wettability. Two different copper surfaces – bare and nano structured - were prepared for the experiments. Their static contact angles are 74° (bare: without surface treatment) and 154° (nano-structured), respectively.
Chan Ho Jeong +5 more
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Frost heave characteristics of undisturbed sensitive Champlain Sea clay
Canadian Geotechnical Journal, 1994Undisturbed Champlain Sea clay samples were subjected to laboratory freezing tests with pore-pressure measurements in order to determine the freezing characteristics of a structured compressible soil. Step-freezing and ramped-freezing tests with applied back pressure were conducted on 10 cm high samples in open-system conditions.
J.-M. Konrad, J.T.C. Seto
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Characteristics of Slope Surfaces Deformed by Frost Heaving
2020Many deformation incidents of cut slopes due to the repetition of freezing and melting in cold-district regions have been reported. Technologies to prevent incidents or mitigate the effects are required to be established. However, it is not easy to judge whether the deformation of a slope surface is due to frost heaving because experiences and ...
Atsuko Sato, Osamu Hatakeyama
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Experimental Thermal and Fluid Science, 2012
Abstract The frost crystals present needle-like shapes and dendrite growth patterns at the initial period of the frost formation on cold surfaces. They gradually turn into plane-like shapes with time disappear. After frost crystals cover the whole cold surface, the frost formation steps into the frost layer growth period.
Yaomin Liu +2 more
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Abstract The frost crystals present needle-like shapes and dendrite growth patterns at the initial period of the frost formation on cold surfaces. They gradually turn into plane-like shapes with time disappear. After frost crystals cover the whole cold surface, the frost formation steps into the frost layer growth period.
Yaomin Liu +2 more
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