Application of Prandtl's theory in the design of an experimental chamber for static pressure measurements

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F21%3A00547472" target="_blank" >RIV/68081731:_____/21:00547472 - isvavai.cz</a>

Alternative codes found

RIV/00216305:26220/21:PU141924

Result on the web

<a href="https://www.mdpi.com/1424-8220/21/20/6849" target="_blank" >https://www.mdpi.com/1424-8220/21/20/6849</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/s21206849" target="_blank" >10.3390/s21206849</a>

Result language

angličtina

Original language name

Application of Prandtl's theory in the design of an experimental chamber for static pressure measurements

Original language description

Pumping in vacuum chambers is part of the field of environmental electron microscopy. These chambers are separated from each other by a small-diameter aperture that creates a critical flow in the supersonic flow regime. The distribution of pressure and shock waves in the path of the primary electron beam passing through the differentially pumped chamber has a large influence on the quality of the resulting microscope image. As part of this research, an experimental chamber was constructed to map supersonic flow at low pressures. The shape of this chamber was designed using mathematical–physical analyses, which served not only as a basis for the design of its geometry, but especially for the correct choice of absolute and differential pressure sensors with respect to the cryogenic temperature generated in the supersonic flow. The mathematical and physical analyses presented here map the nature of the supersonic flow with large gradients of state variables at low pressures at the continuum mechanics boundary near the region of free molecule motion in which the Environmental Electron Microscope and its differentially pumped chamber operate, which has a significant impact on the resulting sharpness of the final image obtained by the microscope. The results of this work map the flow in and behind the Laval nozzle in the experimental chamber and are the initial basis that enabled the optimization of the design of the chamber based on Prandtl’s theory for the possibility of fitting it with pressure probes in such a way that they can map the flow in and behind the Laval nozzle.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20303 - Thermodynamics

Project

<a href="/en/project/GA19-03909S" target="_blank" >GA19-03909S: Advanced simulations of electron-gas interactions for high-efficiency detection of secondary electrons under dynamic in-situ experiments in ESEM.</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Sensors

ISSN

1424-8220

e-ISSN

1424-8220

Volume of the periodical

21

Issue of the periodical within the volume

20

Country of publishing house

CH - SWITZERLAND

Number of pages

13

Pages from-to

6849

UT code for WoS article

000714802000001

EID of the result in the Scopus database

2-s2.0-85117003015