Hysteresis in a Capillary Condensation System

1994 ◽  
Vol 366 ◽  
Author(s):  
M. P. Lilly ◽  
R. B. Hallock
Keyword(s):  
Experimental Data ◽  
Porous Material ◽  
Capillary Condensation ◽  
Hysteretic Behavior ◽  
Preisach Model

ABSTRACTWe report measurements of the hysteretic capillary condensation of liquid 4He into the porous material Nuclepore. Results are presented for global and hysteretic behavior for 300 Å diameter pores. These observations deviate from the predictions of the Preisach model of independent hysteresis domains. By modifying the Preisach model so as to restrict the ability of some of the pores to drain normally we are able to model many features of the experimental data.

Capillary Condensation of Light Hydrocarbons in MCM-41 - Type Mesoporous Materials

1996 ◽  
Vol 454 ◽  
Author(s):  
M. A. Ioneva ◽  
R. G. Mallinson ◽  
J. H. Harwell
Keyword(s):  
Experimental Data ◽  
Mesoporous Materials ◽  
Capillary Condensation ◽  
Light Hydrocarbon ◽  
Unique Characteristic ◽  
Fluid Density ◽  
Light Hydrocarbons ◽  
Templated Materials ◽  
Mcm 41

ABSTRACTThe MCM-41 family of surfactant templated materials were used as model mesoporous sorbents for storage of light hydrocarbon vapors, by utilizing the phenomenon of capillary condensation. The experimental data show that, because of the fine tunability of MCM-41 type materials (mesopore diameter was controlled between 20 and 40 Å), the onset of capillary condensation can be controlled, and from here the point of achieving liquid-like fluid density in the pores. Such a unique characteristic makes the MCM-41 family of materials a potential media for sorptive fractionation.

scholarly journals Investigating the Hysteretic Behavior of Concrete-Filled Steel Tube Arch by Using a Fiber Beam Element

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Jun Ma ◽  
Yang Liu ◽  
Qingfei Gao ◽  
Kang Hou
Keyword(s):  
Experimental Data ◽  
Transverse Direction ◽  
Vertical Direction ◽  
Beam Element ◽  
Steel Tube ◽  
Hysteretic Behavior ◽  
Constitutive Relationship ◽  
Concrete Filled Steel Tube ◽  
Hysteretic Performance ◽  
Fiber Beam Element

A fiber beam finite element that could account for the nonlinear constitutive relationship between steel and concrete was applied to investigate the hysteretic behavior of concrete filled steel tube (CFT) arch ribs of bridges. At first, the effectiveness of this fiber beam element using for nonlinear analysis was verified by comparing the analytical results with the experimental data, and then this composite element was applied to analyze the hysteretic performance of CFT arch ribs. The following hysteretic behavior of CFT arch ribs of bridges was investigated such as the hysteretic behaviors of moment-curvature of arch ribs in vertical direction of bridge and the hysteretic relationship between load and displacement of arch ribs in longitudinal and transverse direction of bridge. Finally, some parameters affecting the hysteretic behaviors of CFT arch ribs were presented by evaluating the capacity of ductility of CFT arch ribs.

scholarly journals Dynamics of thermal and moistening fronts in porous material under capillary moistening

2013 ◽  
Vol 17 (4) ◽  
pp. 1071-1078 ◽  
Author(s):  
Mikhail Nizovtsev ◽  
Alexey Sterlyagov ◽  
Viktor Terekhov
Keyword(s):  
Experimental Data ◽  
Porous Material ◽  
Gamma Ray ◽  
Ir Thermography ◽  
Ray Method ◽  
Thermal Front

IR thermography and gamma-ray method were used to experimentally study motion of thermal and moistening fronts in a porous material under capillary moistening. It is shown that at capillary moistening propagation of the moistening front may be accompanied by the thermal front due to sorption processes. On the basis of obtained experimental data the relation between propagation of two fronts has been established.

Hysteretic Behaviors of Yield Stress in Smart ER/MR Materials: Experimental Results

2006 ◽  
Vol 326-328 ◽  
pp. 1459-1462
Author(s):  
Young Min Han ◽  
Quoc Hung Nguyen ◽  
Seung Bok Choi ◽  
Kyung Su Kim
Keyword(s):  
Yield Stress ◽  
Smart Materials ◽  
Hysteretic Behavior ◽  
Preisach Model ◽  
Hysteresis Model ◽  
First Order ◽  
Input Field ◽  
Nonlinear Hysteresis ◽  
Field Dependent ◽  
Discrete Manner

This paper experimentally investigates the hysteretic behaviors of yield stress in electrorheological (ER) and magnetorheological (MR) materials which are known as smart materials. As a first step, the PMA-based ER material is prepared by dispersing the chemically synthesized polymethylaniline (PMA) particles into non-conducting oil. For the MR material, commercially available one (Lord MRF-132LD) is chosen for the test. Using the rheometer, the torque resulting from the shear stress of the ER/MR materials is measured, and then the yield stress is calculated from the measured torque. In order to describe the hysteretic behavior of the fielddependent yield stress, a nonlinear hysteresis model of the ER/MR materials is formulated between input (field) and output (yield stress). Subsequently, the Preisach model is identified using experimental first order descending (FOD) curves of yield stress in discrete manner. The effectiveness of the identified hysteresis model is verified in time domain by comparing the predicted field-dependent yield stress with the measured one.

A Modified Fractional Calculus Approach to Model Hysteresis

2010 ◽  
Vol 77 (3) ◽  
Author(s):  
Mohammed Rabius Sunny ◽  
Rakesh K. Kapania ◽  
Ronald D. Moffitt ◽  
Amitabh Mishra ◽  
Nakhiah Goulbourne
Keyword(s):  
Experimental Data ◽  
Fractional Calculus ◽  
Fractional Derivative ◽  
Fractional Integral ◽  
Conductive Polymer ◽  
Polymer Nanocomposite ◽  
Hysteretic Behavior ◽  
Integral Model ◽  
Strain Variation ◽  
Integer Order

This paper describes the development of a fractional calculus approach to model the hysteretic behavior shown by the variation in electrical resistances with strain in conductive polymers. Experiments have been carried out on a conductive polymer nanocomposite sample to study its resistance-strain variation under strain varying with time in a triangular manner. A combined fractional derivative and integer order integral model and a fractional integral model (with two submodels) have been developed to simulate this behavior. The efficiency of these models has been discussed by comparing the results, obtained using these models, with the experimental data. It has been shown that by using only a few parameters, the hysteretic behavior of such materials can be modeled using the fractional calculus with some modifications.

scholarly journals Radial Imbibition in Paper under Temperature Differences

Fluids ◽  
2019 ◽  
Vol 4 (2) ◽  
pp. 86
Author(s):  
Abel López-Villa ◽  
Abraham Medina ◽  
F. J. Higuera ◽  
Jonatan R. Mac Intyre ◽  
Carlos Alberto Perazzo ◽  
...  
Keyword(s):  
Experimental Data ◽  
Surface Tension ◽  
Porous Material ◽  
Radial Temperature ◽  
Temperature Variations ◽  
One Dimensional ◽  
Blotting Paper ◽  
Dimensional Equation ◽  
The One ◽  
Account Temperature

Spontaneous radial imbibition into thin circular samples of porous material when they have been subjected to radial temperature differences was analyzed theoretically and experimentally. The use of the Darcy equation allowed us to take into account temperature variations in the dynamic viscosity and surface tension in order to find the one-dimensional equation for the imbibition fronts. Experiments using blotting paper showed a good fit between the experimental data and theoretical profiles through the estimation of a single parameter.

scholarly journals Preisach Elasto-Plastic Model for Mild Steel Hysteretic Behavior-Experimental and Theoretical Considerations

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3546
Author(s):  
Dragoslav Sumarac ◽  
Petar Knezevic ◽  
Cemal Dolicanin ◽  
Maosen Cao
Keyword(s):  
Cyclic Loading ◽  
Mild Steel ◽  
Heat Dissipation ◽  
Split Ring Resonator ◽  
Theoretical Background ◽  
Hysteretic Behavior ◽  
Preisach Model ◽  
Predicting Behavior ◽  
Theoretical Considerations ◽  
Theoretical Results

The Preisach model already successfully implemented for axial and bending cyclic loading is applied for modeling of the plateau problem for mild steel. It is shown that after the first cycle plateau disappears an extension of the existing Preisach model is needed. Heat dissipation and locked-in energy is calculated due to plastic deformation using the Preisach model. Theoretical results are verified by experiments performed on mild steel S275. The comparison of theoretical and experimental results is evident, showing the capability of the Presicah model in predicting behavior of structures under cyclic loading in the elastoplastic region. The purpose of this paper is to establish a theoretical background for embedded sensors like regenerated fiber Bragg gratings (RFBG) for measurement of strains and temperature in real structures. In addition, the present paper brings a theoretical base for application of nested split-ring resonator (NSRR) probes in measurements of plastic strain in real structures.

Investigation Of The Air Flow In Heated Highly Porous Cellular Materials

2017 ◽  
Vol 12 (2) ◽  
pp. 66-74
Author(s):  
Sergey Mironov ◽  
Tatyana Poplavskaya ◽  
Stanislav Kirilovskiy
Keyword(s):  
Experimental Data ◽  
Reynolds Number ◽  
Porous Material ◽  
Filtration Rate ◽  
Cellular Materials ◽  
Air Filtration ◽  
Wide Range ◽  
Highly Porous Cellular Materials ◽  
Skeletal Model ◽  
Highly Porous

Measurements of air filtration rate through the highly porous cellular materials in the presence of heating a porous material were carried out. A new measurement technique was developed and data of the dependence of the filtration rate of the temperature of air passing through the porous material were obtained with different pore size and in wide range Reynolds number. The experimental data were compared with the results of numerical modeling of the airflow in the porous samples, based on skeletal model of the cellular-porous material.

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