Complete adiabatic evaporation of highly superheated liquid jets

1992 ◽  
Vol 236 ◽  
pp. 43-59 ◽  
Author(s):  
Th. Kurschat ◽  
H. Chaves ◽  
G. E. A. Meier
Keyword(s):  
Superheated Liquid ◽  
Liquid Jets ◽  
Final State ◽  
Supersonic Expansion ◽  
Cubic Equation ◽  
Physical Effects ◽  
Molecular Complexity ◽  
New Phenomena ◽  
Good Agreement ◽  
Adiabatic Evaporation

A nozzle expansion into a vacuum chamber was used to investigate the evaporation of highly superheated liquid jets. The large molar specific heat of fluids with high molecular complexity — in this case C6F14 — is responsible for the new phenomena reported here. A model was developed to describe the basic physical effects. A cubic equation of state was used to describe the thermodynamic properties of the fluid. The evaporation was modelled as a sonic deflagration followed by an axisymmetric supersonic expansion. As in the case of hypersonic gas jets the final state is reached by a normal shock. For sufficiently high temperatures and expansion ratios a complete adiabatic evaporation of the liquid was found. At even higher temperatures the liquid evaporates completely within a rarefaction discontinuity. The predictions of the model are in good agreement with the experimental results.

Flicker-Noise in Superheated Liquid Jets

2004 ◽  
Vol 35 (1-2) ◽  
pp. 59-66
Author(s):  
A. V. Reshetnikov ◽  
V. P. Skripov ◽  
V. P. Koverda ◽  
V. N. Skokov ◽  
N. A. Mazheiko ◽  
...  
Keyword(s):  
Flicker Noise ◽  
Superheated Liquid ◽  
Liquid Jets

Modeling of Discrete Tip Injection in a Two-Dimensional Streamline Curvature Method

2012 ◽  
Author(s):  
Roland Matzgeller ◽  
Richard Pichler
Keyword(s):  
Rotating Stall ◽  
Streamline Curvature ◽  
Measurement Results ◽  
Compressor Design ◽  
Multistage Compressor ◽  
Physical Effects ◽  
Tip Injection ◽  
Stability Enhancement ◽  
Good Agreement ◽  
Streamline Curvature Method

Fluid injection at the tip of highly loaded compressor rotors is known to be effective in suppressing the onset of rotating stall and eventually compressor instability. However, using such stability enhancement methods in a multistage compressor might not only stabilize certain stages but has also an impact on radial and axial matching. In order to account for tip injection during the early stages of compressor design, this paper focuses on the development of a method to model the physical effects underlying tip injection within a streamline curvature method. With the help of system identification it could be shown that a rotor subject to the discrete jets of tip injection adapts to the varying flow conditions according to a first order model. This information was used to generate a time-dependent input for the steady equations used with a streamline curvature method and eventually to model the unsteady response of the rotor to tip injection. Comparing the results obtained with the enhanced streamline curvature model to measurement results, good agreement could be shown which raised confidence that the influence of tip injection on axial and radial matching was sufficiently captured.

scholarly journals EVENTS WITH ISOLATED CHARGED LEPTONS AND LARGE MISSING TRANSVERSE MOMENTUM AT HERA

2004 ◽  
Vol 19 (25) ◽  
pp. 1881-1902 ◽  
Author(s):  
TANCREDI CARLI ◽  
DOMINIK DANNHEIM ◽  
LORENZO BELLAGAMBA
Keyword(s):  
Transverse Momentum ◽  
Zeus Collaboration ◽  
Tau Leptons ◽  
High Luminosity ◽  
Final State ◽  
Missing Transverse Momentum ◽  
State Formula ◽  
Charged Leptons ◽  
Good Agreement ◽  
Event Topology

Striking events with isolated charged leptons, large missing transverse momentum and large transverse momentum of the hadronic final state [Formula: see text] were observed at the electron proton collider HERA in a data sample corresponding to an integrated luminosity of about 130 pb-1. The H1 collaboration observed 11 events with isolated electrons or muons and with [Formula: see text]. Only 3.4±0.6 events were expected from Standard Model (SM) processes. Six of these events have [Formula: see text], while 1.3±0.3 events were expected. The ZEUS collaboration observed good agreement with the SM. However, ZEUS found two events with a similar event topology, but tau leptons instead of electrons or muons in the final state. Only 0.2±0.05 events were expected from SM processes. For various hypotheses, the compatibility of the experimental results was investigated with respect to the SM and with respect to possible explanations beyond the SM. Prospects for the high-luminosity HERA-II data taking period are given.

scholarly journals Flashing and Shattering Phenomena of Superheated Liquid Jets.

1994 ◽  
Vol 37 (2) ◽  
pp. 313-321 ◽  
Author(s):  
Erasmus Mhina Peter ◽  
Akira Takimoto ◽  
Yujiro Hayashi
Keyword(s):  
Superheated Liquid ◽  
Liquid Jets

Study of event mixing for Bose–Einstein correlations in reactions with ππ X final states around 1 GeV

2017 ◽  
Vol 32 (23) ◽  
pp. 1750118
Author(s):  
Q. H. He
Keyword(s):  
Correlation Function ◽  
Momentum Distribution ◽  
Final States ◽  
Relative Momentum ◽  
Final State ◽  
Numerical Tests ◽  
Pion Energy ◽  
Simulation Results ◽  
Bose Einstein ◽  
Good Agreement

We present a new event mixing cut condition, named energy sum (ES) cut, aiming to investigate two-pion Bose–Einstein correlations (BEC) in reaction with only two identical pions among three final state particles. Unlike the previous proposed pion energy cut, which rejects original events with either pion’s energy beyond a given level, this cut does not eliminate any original events and hence improves the statistics of both original events and mixed events. It selects mixed events in terms of a weight proportional to the two-pion energy sum distribution of original events. Numerical tests using the [Formula: see text] events are carried out to verify the validity of the energy sum cut. Simulation results show this cut is able to reproduce the relative momentum distribution of the original events in the absence of BEC effects. Its ability to observe BEC effects and to extract correct BEC parameters is verified using event sample in the presence of BEC effects. It is found that the BEC effects can be obviously observed as an enhancement in the correlation function and the BEC parameters extracted by this event mixing cut are in good agreement with input values.

scholarly journals Beating the Jetting Regime

2012 ◽  
Vol 13 (5) ◽  
Author(s):  
Alban Sauret ◽  
Ho Cheung Shum
Keyword(s):  
Flow Rate ◽  
Scaling Laws ◽  
Scaling Law ◽  
Good Control ◽  
Theoretical Modelling ◽  
Liquid Jets ◽  
Emulsion Droplets ◽  
Novel Approach ◽  
Break Up ◽  
Good Agreement

AbstractWe study numerically the dynamics of jets and drops in a microcapillary co-flow device. The co-flow stream encounters different flow regimes, including dripping, jetting. Using a level-set/finite element axysimmetric numerical simulation, we study the dynamics of breakup of a jet subject to flow rate perturbations. A scaling law for the width of the unperturbed jet is presented and compared to existing experimental results as well as numerical measurements. Then, we show that the introduction of a sinusoidal perturbation of the inner fluid flow rate can facilitate breakup of the fluid in regimes where a jet is usually observed. Moreover, the flow rate perturbation leads to a good control over the size and the frequency of the resulting droplets. Using theoretical modelling, we provide a criterion to determine the optimal frequency to break up the jet. We also derive scaling laws to determine the volume of inner fluid encapsulated in the emulsion droplets as a function of the frequency and to estimate the distance for the jet to break up as a function of the amplitude of perturbation. These scaling laws are in good agreement with results of numerical simulations. Our work suggests a novel approach and offers guiding principles to break up liquid jets in cases where dripping is difficult to achieve.

scholarly journals Study of final state photons in hadronicZ 0 decay and limits on new phenomena

1992 ◽  
Vol 53 (4) ◽  
pp. 555-565 ◽  
Author(s):  
◽  
P. Abreu ◽  
W. Adam ◽  
F. Adami ◽  
T. Adye ◽  
...  
Keyword(s):  
Final State ◽  
New Phenomena

scholarly journals An Empirical Model of Submicrocrystalline Structure Formation and Hardening upon Severe Plastic Deformation in Iron

2020 ◽  
Author(s):  
Mikhail I. Degtyarev ◽  
Tatiana I. Chashchukhina ◽  
Lyudmila M. Voronova ◽  
Alexander M. Patselov ◽  
Vitaliy P. Pilyugin ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Pure Iron ◽  
Nano Structure ◽  
Material Hardness ◽  
Tem Microscopy ◽  
Physical Effects ◽  
Piecewise Model ◽  
Fitting Parameters ◽  
Good Agreement

The evolution of metals micro/nano-structure upon severe plastic deformation (SPD) is still far to be theoretically explained, while experimental datasets are persistently growing for several decades. Major problem associated with understanding of SPD is related to a fact that the latter is a synergetic product of several competing physical effects which alter the material micro/nano-structure. In attempt to find deformational boundaries, where predominantly one mechanism determines the micro/nano-structure, in this paper we propose a continuous piecewise model for the analysis of experiments on material hardness vs strain of SPD processed materials. The novelty of this approach lies in its ability to find, as free-fitting parameters, the strain breakpoints which separate different micro/nano-structure modes generated upon SPD process. The model is applied to analyse experimental data for polycrystalline samples of pure iron and two distinctive strain breakpoints are revealed with good accuracies. This finding is in a good agreement with our earlier results on TEM microscopy studies on pure iron polycrystals after SPD treatment.

Sign in / Sign up

Export Citation Format

Share Document