GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • AIP Publishing  (5)
  • 1
    Online Resource
    Online Resource
    Experiment study on a spiral-cup shaped TMF contact
    AIP Publishing ; 2019
    In:  AIP Advances Vol. 9, No. 1 ( 2019-01-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 9, No. 1 ( 2019-01-01)
    Abstract: In this paper, combined with the characteristics of spiral-shaped transverse magnetic field (TMF) contacts and cup-shaped TMF contacts, a new structure of spiral-cup shaped contacts was designed. Firstly, experiments were carried out on two kinds of TMF contacts – the traditional cup shaped contacts and the new spiral-cup shaped contacts. Arc behaviors were recorded and the arc motion were studied. The experimental results indicated that the arc motion between new contacts was better than that between the traditional cup-shaped contacts. Here, we paid particular attention to the arc characteristics between spiral-cup shaped TMF contacts. The duration and threshold current of different stages with different tested currents were discussed, and the arc characteristics during arc motion stage was analyzed. Moreover, electromagnetic field simulation was conducted on above two kinds of TMF contacts, and the distributions of magnetic field and the electromagnetic forces acted on arc were compared. According to the simulation results, some experimental phenomena were explained theoretically. In addition, the spiral-cup shaped structure proposed here makes it possible to research on arc movement mechanism without considering the complex mechanism of arc stepping over slots.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5047001
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2583909-3
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Derivation of a continuum model and the energy law for moving contact lines with insoluble surfactants
    AIP Publishing ; 2014
    In:  Physics of Fluids Vol. 26, No. 6 ( 2014-06-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 26, No. 6 ( 2014-06-01)
    Abstract: A continuous model is derived for the dynamics of two immiscible fluids with moving contact lines and insoluble surfactants based on thermodynamic principles. The continuum model consists of the Navier-Stokes equations for the dynamics of the two fluids and a convection-diffusion equation for the evolution of the surfactant on the fluid interface. The interface condition, the boundary condition for the slip velocity, and the condition for the dynamic contact angle are derived from the consideration of energy dissipations. Different types of energy dissipations, including the viscous dissipation, the dissipations on the solid wall and at the contact line, as well as the dissipation due to the diffusion of surfactant, are identified from the analysis. A finite element method is developed for the continuum model. Numerical experiments are performed to demonstrate the influence of surfactant on the contact line dynamics. The different types of energy dissipations are compared numerically.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/1.4881195
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Experimental investigation on the initial expansion stage of vacuum arc on cup-shaped TMF contacts
    AIP Publishing ; 2018
    In:  Physics of Plasmas Vol. 25, No. 2 ( 2018-02-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 25, No. 2 ( 2018-02-01)
    Abstract: Arc behavior and measures to control it directly affect the properties of vacuum circuit breakers. Nowadays, transverse magnetic field (TMF) contacts are widely used for medium voltages. A magnetic field perpendicular to the current direction between the TMF contacts makes the arc move, transmitting its energy to the whole contact and avoiding excessive local ablation. Previous research on TMF arc behavior concentrated mainly on the arc movement and less on the initial stage (from arc ignition to an unstable arc column). A significant amount of experiment results suggest that there is a short period of arc stagnation after ignition. The duration of this arc stagnation and the arc characteristics during this stage affect the subsequent arc motion and even the breaking property of interrupters. The present study is of the arc characteristics in the initial stage. Experiments were carried out in a demountable vacuum chamber with cup-shaped TMF contacts. Using a high-speed camera, both single-point arc ignition mode and multiple-point arc ignition (MPAI) mode were observed. The experimental data show that the probability of MPAI mode occurring is related to the arc current. The influences of arc-ignition mode, arc current, and contact diameter on the initial expansion process were investigated. In addition, simulations were performed to analyze the multiple arc expansion process mechanically. Based on the experimental phenomena and simulation results, the mechanism of the arc expansion motion was analyzed.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.5016928
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 1472746-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    TaS2 nanosheet-based room-temperature dosage meter for nitric oxide
    AIP Publishing ; 2014
    In:  APL MATERIALS Vol. 2, No. 9 ( 2014-09-01)
    Details
    In: APL MATERIALS, AIP Publishing, Vol. 2, No. 9 ( 2014-09-01)
    Abstract: A miniature dosage meter for toxic gas is developed based on TaS2 nanosheets, which is capable of indicating the toxic dosage of trace level NO at room temperature. The TaS2 film-based chemiresistor shows an irreversible current response against the exposure of NO. The unique non-recovery characteristic makes the TaS2 film-based device an ideal indicator of total dosage of chronicle exposure.
    Type of Medium: Online Resource
    ISSN: 2166-532X
    URL: Article
    DOI: 10.1063/1.4893237
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 2722985-3
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Influence of axial self-magnetic field component on arcing behavior of spiral-shaped contacts
    AIP Publishing ; 2015
    In:  Physics of Plasmas Vol. 22, No. 10 ( 2015-10-01)
    Details
    In: Physics of Plasmas, AIP Publishing, Vol. 22, No. 10 ( 2015-10-01)
    Abstract: The transverse magnetic field (TMF) contact design is commonly used in vacuum interrupters. When arcing occurs between the TMF contacts, the contact structure can create a self-induced magnetic field that drives the arc to move and rotate on the contact, and thus local overheating and severe erosion can be avoided. However, TMF contacts could also create an axial self-magnetic component, and the influence of this component on the arc behavior has not been considered to date. In this paper, five different types of Cu-Cr spiral-shaped TMF contacts with three different structures are investigated in a demountable vacuum chamber that contains a high-speed charge-coupled device video camera. It was found that the contact structure greatly influenced the arc behavior, especially in terms of arc rotation and the effective contact area, while contacts with the same slot structure but different diameters showed similar arc behavior and arc motion. The magnetic field distribution and the Lorentz force of each of the three different contact structures are simulated, and the axial self-magnetic field was first taken into consideration for investigation of the TMF contact design. It was found that contact designs that have higher axial self-magnetic field components tend to have arc columns with larger diameters and show poorer arc motion and rotation performance in the experiments.
    Type of Medium: Online Resource
    ISSN: 1070-664X , 1089-7674
    URL: Article
    DOI: 10.1063/1.4933003
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 1472746-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...