Experimental study of capillary water migration in vertically parallel-plate fractures in rock masses in cold regions

2022 ◽  
Vol 15 (1) ◽  
Author(s):  
Liping Wang ◽  
Ning Li ◽  
Yanzhe Tian ◽  
Naifei Liu ◽  
Shuanhai Xu
Keyword(s):  
Experimental Study ◽  
Parallel Plate ◽  
Water Migration ◽  
Rock Masses ◽  
Capillary Water ◽  
Cold Regions

AN EXPERIMENTAL STUDY OF ENHANCEMENT OF FORCED CONVECTION HEAT TRANSFER FROM PARALLEL PLATE FINS WITH CUTS

Equipment ◽  
2006 ◽  
Author(s):  
E. N. Pis'mennyi ◽  
V. A. Rogachev ◽  
A. M. Terekh ◽  
Georgiy Polupan ◽  
I. Carvajal-Mariscal ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Forced Convection ◽  
Parallel Plate ◽  
Convection Heat Transfer ◽  
Convection Heat ◽  
Forced Convection Heat Transfer

scholarly journals Experimental Study on Nano-SiO2 Improving Concrete Durability of Bridge Deck Pavement in Cold Regions

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Youkun Cheng ◽  
Zhenwu Shi
Keyword(s):  
Experimental Study ◽  
Abrasion Resistance ◽  
Calcium Silicate Hydrate ◽  
Bridge Deck ◽  
Hardened Cement ◽  
Concrete Durability ◽  
Ion Permeability ◽  
Cold Regions ◽  
Bridge Deck Pavement ◽  
Early Damage

In order to reduce early damage of bridge deck pavement concrete in cold regions, a certain content of nano-SiO2 is added into the concrete to enhance its durability. Through tests on four durability indexes, strength, frost resistance, resistance to Cl− ion permeability, and abrasion resistance of concrete with 1% nano-SiO2 content and concrete without nano-SiO2, the ability of nano-SiO2 to improve the concrete durability of bridge deck pavement is evaluated. The results of tests and analysis show that the incorporation of nano-SiO2 greatly improves the four durability indexes. Nano-SiO2 effectively absorbs the calcium hydroxide released early by the hydration of cement, increases the calcium silicate hydrate content, and elevates the interface between the paste and aggregate of the hardened cement, which improves the durability of the concrete.

Experimental study on heat transfer of upright pipes in cold regions

2017 ◽  
Vol 117 ◽  
pp. 17-23 ◽  
Author(s):  
Fenglei Han ◽  
Lin Chen ◽  
Wenbing Yu ◽  
Weibo Liu ◽  
Xin Yi
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Cold Regions

Experimental Study of Long-Term Static Friction and Magnetic Slider/Disk Interplanar Separation

1996 ◽  
Vol 118 (1) ◽  
pp. 12-20 ◽  
Author(s):  
C. T. Gerber ◽  
B. Bhushan ◽  
N. V. Gitis
Keyword(s):  
Experimental Study ◽  
Parallel Plate ◽  
Static Friction ◽  
Lubricant Thickness

Capacitance between a slider and disk was measured to relate slider/disk interplanar separation to static friction. The parallel plate capacitance formula was used to convert the capacitance into separation with a resolution of less than 1 nm. Separation and coefficient of static friction (stiction) were measured using assorted lubricant thicknesses with and without bonding on polished and textured disks. Separation was measured during contact start/stop (CSS) and long term slider dwell times, after which static friction was measured. Polished disks had high stiction events with smaller separations during and after the stiction event, unlike textured disks. Long-term dwell studies showed the coefficient of static friction and slider micro descent (decrease in interplanar separation) to be greatest with greater lubricant thickness and polished disks. Static friction and separation with bonded and unlubricated disks were time independent.

A numerical and experimental study on a parallel plate ice bank

1999 ◽  
Vol 19 (2) ◽  
pp. 163-193 ◽  
Author(s):  
K.A.R. Ismail ◽  
O.C. Quispe ◽  
J.R. Henrı́quez
Keyword(s):  
Experimental Study ◽  
Parallel Plate

scholarly journals Ice Lensing, Thermal Diffusion and Water Migration in Freezing Soil

1967 ◽  
Vol 6 (47) ◽  
pp. 681-694 ◽  
Author(s):  
Andrew C. Palmer
Keyword(s):  
Experimental Study ◽  
Surface Layer ◽  
Ice Nucleation ◽  
Water Migration ◽  
One Dimensional ◽  
Freezing Soil ◽  
Infinite Mass ◽  
Soil Thermal Diffusivity ◽  
Homogeneous Soil ◽  
Water Diffusion Coefficient

When a surface layer of the soil freezes, both heat and water diffuse from the unfrozen soil beneath to the frozen region. Often the soil does not freeze homogeneously but distinct ice lenses form. An analysis of the diffusion and ice nucleation processes suggests conditions under which ice lensing can be expected; in particular, it is shown that multiple ice lenses cannot form unless the soil thermal diffusivity is greater than the water diffusion coefficient. Analysis of a simple one-dimensional case (a semi-infinite mass of homogeneous soil whose surface temperature is suddenly lowered) gives the temperature and water-content fields as functions of time; these agree with those observed in an experimental study of freezing clay.

Study of the Influence of Biodegradation on Coal Micro-Nano Pore Structure Using Low-Temperature N2 Adsorption

2021 ◽  
Vol 21 (1) ◽  
pp. 720-726
Author(s):  
Hongli Kang ◽  
Xiangrong Liu ◽  
Zaiwen Yang ◽  
Shunsheng Zhao ◽  
Zheng Yang
Keyword(s):  
Experimental Study ◽  
Low Temperature ◽  
Specific Surface ◽  
Pore Structure ◽  
Parallel Plate ◽  
Alcaligenes Faecalis ◽  
Bacterial Degradation ◽  
N2 Adsorption ◽  
Before And After ◽  
Coal Biodegradation

An experimental study of biodegradation of Shenmu coal was carried out by using Ochrobactrum cytisi, Novospingobium naphthalenivorans, Alcaligenes faecalis and Pseudomonas fluorescens. The micro-nano pore structure of coal samples before and after biodegradation was studied by low-temperature N2 adsorption. For biodegraded coal, the results showed that micropores and mesopores are primarily open pores with good connectivity, including parallel plate pores and cylinder pores with two open ends; the specific surface area of biodegraded coal decreased from 2.2174 m2/g to 1.6255˜2.0537 m2/g, and the pore size of the coal biodegraded by the four bacteria decreased following biodegradation from 250 nm to 170˜200 nm, which may be due to collapse of the coal structure due to the bacterial degradation. Coal biodegradation by the dominant bacterium P. fluorescens led to a diminished mesopore size and an increased number of smaller mesopores, with the smaller mesopores gradually taking on dominant roles.

Design of an Intelligent De-Icing System for Offshore Structures

2013 ◽  
Vol 321-324 ◽  
pp. 1602-1608 ◽  
Author(s):  
Kamran Zaman ◽  
Umair Najeeb Mughal ◽  
Muhammad Shakeel Virk
Keyword(s):  
Experimental Study ◽  
Surface Temperature ◽  
Control Method ◽  
Sea Water ◽  
Control Unit ◽  
Offshore Structures ◽  
Preliminary Design ◽  
Operational Environment ◽  
Cold Regions ◽  
Cold Room

The offshore activities in cold waters have moved from shallow to deep sea waters, which require different operations as compared to activities in hot sea water. Such offshore operations in cold regions like arctic may be effected by the ice accretion on deck and other areas of structure. Ice mainly accretes from both sea spray and atmospheric icing, which can create problems for operational environment and safety of people working on offshore structures in cold regions. In this research a lab based experimental study has been carried out to preliminary design and test an intelligent thermal anti/de-icing system. The experimental study was carried out in cold room chamber of Narvik University College, where temperature can be well controlled between +10 to-30 °C. The proposed intelligent thermal based deicing system can be used to control the communication between icing sensors, weather station, heating devices and central control unit. In this preliminary design phase, a simple surface temperature control method has been developed and tested that can further provides an efficient thermal deicing method and will also be capable to control the surface temperature of objects of interest in cold regions

Sign in / Sign up

Export Citation Format

Share Document