Simulation and experimental verification of water-guided laser processing by a water-gas shrinkage laminar flow method

2019 ◽  
Author(s):  
Guangyi Zhang ◽  
Yaowen Wu ◽  
Zheng Zhang ◽  
Chunhai Guo ◽  
Wenwu Zhang
Keyword(s):  
Laminar Flow ◽  
Experimental Verification ◽  
Laser Processing ◽  
Flow Method ◽  
Water Gas

Device for monitoring sugar-solution concentration by a thermophysical laminar-flow method

1994 ◽  
Vol 37 (5) ◽  
pp. 585-589
Author(s):  
S. V. Ponomarev ◽  
S. V. Mishchenko ◽  
V. M. Zhilkin ◽  
A. V. Sinel'nikov
Keyword(s):  
Laminar Flow ◽  
Solution Concentration ◽  
Sugar Solution ◽  
Flow Method

Dynamic Thin Laminar Flow Method for Making Protein Monolayers

Langmuir ◽  
1997 ◽  
Vol 13 (2) ◽  
pp. 264-276 ◽  
Author(s):  
G. Picard ◽  
I. Nevernov ◽  
D. Alliata ◽  
L. Pazdernik
Keyword(s):  
Laminar Flow ◽  
Flow Method ◽  
Protein Monolayers

scholarly journals Gas shrinking laminar flow for robust high-power waterjet laser processing technology

2019 ◽  
Vol 27 (26) ◽  
pp. 38635 ◽  
Author(s):  
Guangyi Zhang ◽  
Zheng Zhang ◽  
Yufeng Wang ◽  
Chunhai Guo ◽  
Wenwu Zhang
Keyword(s):  
Laminar Flow ◽  
High Power ◽  
Laser Processing ◽  
Processing Technology

Longitudinal Motion Modeling and Experimental Verification of a Microrobot Subject to Liquid Laminar Flow

2021 ◽  
pp. 1-1
Author(s):  
Anil Demircali ◽  
Rahmetullah Varol ◽  
Gizem Aydemir ◽  
Eda Nur Saruhan ◽  
Kadir Erkan ◽  
...  
Keyword(s):  
Laminar Flow ◽  
Experimental Verification ◽  
Longitudinal Motion ◽  
Motion Modeling

A Continuous Boiling Model for Face Seals

1990 ◽  
Vol 112 (2) ◽  
pp. 266-274 ◽  
Author(s):  
J. A. Yasuna ◽  
W. F. Hughes
Keyword(s):  
Laminar Flow ◽  
Phase Change ◽  
Thermal Convection ◽  
Experimental Verification ◽  
Numerical Solutions ◽  
Narrow Range ◽  
Anomalous Behavior ◽  
Adiabatic Flow ◽  
Low Leakage ◽  
Face Seals

Mechanical face seals with phase change have extensive engineering applications, yet little theory exists to predict dynamic and thermodynamic behavior. At present, numerical solutions exist for two operating extremes—for low leakage laminar flow where boiling is assumed to occur discretely, and for high leakage, turbulent adiabatic flow. A model is presented herein which allows for continuous boiling, and considers thermal convection effects in laminar flow. Sample calculations and results are compared to the discrete boiling model, and as leakage increases and convection effects become more important boiling may occur over a large portion of the seal face. It is shown that contrary to the discrete boiling model, there may exist a narrow range of stable or bistable operation even when saturation conditions exist near the seal inlet. Instability will invariably occur however if the seal is sufficiently perturbed. This analysis is intended to explain some of the anomalous behavior observed in typical sealing applications, and to act as a guide for experimental verification.

Residual Gas Reactions in the Electron Microscope: I. Qualitative Observations on the Water Gas Reaction

1968 ◽  
Vol 26 ◽  
pp. 292-293
Author(s):  
Richard E. Hartman ◽  
Roberta S. Hartman ◽  
Peter L. Ramos
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Gas Phase ◽  
Absolute Temperature ◽  
Residual Gas ◽  
Gas Reactions ◽  
Image Position ◽  
The Right ◽  
Water Gas ◽  
Thinning Rate

The action of water and the electron beam on organic specimens in the electron microscope results in the removal of oxidizable material (primarily hydrogen and carbon) by reactions similar to the water gas reaction .which has the form:The energy required to force the reaction to the right is supplied by the interaction of the electron beam with the specimen.The mass of water striking the specimen is given by:where u = gH2O/cm2 sec, PH2O = partial pressure of water in Torr, & T = absolute temperature of the gas phase. If it is assumed that mass is removed from the specimen by a reaction approximated by (1) and that the specimen is uniformly thinned by the reaction, then the thinning rate in A/ min iswhere x = thickness of the specimen in A, t = time in minutes, & E = efficiency (the fraction of the water striking the specimen which reacts with it).

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