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Chamber pressure

About: Chamber pressure is a research topic. Over the lifetime, 2988 publications have been published within this topic receiving 30725 citations.


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Journal ArticleDOI
TL;DR: In this article, the effects of product thickness, chamber pressure and heating conditions on product temperature profiles and production rate of freeze-dried yoghurt were investigated experimentally, and three sample thicknesses -3.8 mm, 6.2 mm and 9.4 mm -were tested at chamber pressures of 0.01 and 0.5 mmHg.
Abstract: The effects of product thickness, chamber pressure and heating conditions on product temperature profiles and production rate of freeze-dried yoghurt were investigated experimentally. Three sample thicknesses - 3.8 mm, 6.2 mm and 9.4 mm - were tested at chamber pressures of 0.01 and 0.5 mmHg. The production rate increased by decreasing product thickness in contact heating through the bottom of the frozen layer, whereas no significant change was observed in radiant heating. A reduction in chamber pressure from 0.50 to 0.01 mmHg increased the drying time in radiant heating. Maximum production rate was obtained when the thickness of dried product was 6.2 mm, when heat was transferred simultaneously through the frozen and dried layers, and the chamber pressure was at 0.01 mmHg. Use of the product tray developed in this study prevents the growth of dry layers at the contact surfaces.

18 citations

Journal ArticleDOI
TL;DR: In this paper, a carbon dioxide laser supersonic drawing was carried out by irradiating the laser to the as-spun poly(ethylene-2,6-naphthalate) (PEN) fiber in a low-temperature super-drone.
Abstract: Poly(ethylene-2,6-naphthalate) (PEN) nanofiber was prepared by a carbon dioxide (CO2) laser supersonic drawing. The CO2 laser supersonic drawing was carried out by irradiating the laser to the as-spun PEN fiber in a low-temperature supersonic jet. The supersonic jet was generated by blowing off air into a vacuum chamber from a fiber supplying orifice. The flow velocity from the orifice can be estimated by applying Graham's theorem from the pressure difference between the atmospheric pressure and the pressure of the vacuum chamber. The fastest flow velocity estimated was 396 m s−1 (Mach 1.15) at a chamber pressure of 6 KPa. The nanofiber obtained at Mach 1.15 was the oriented nanofibers with an average diameter of 0.259 μm, and its draw ratio estimated from the diameters before and after the drawing reached 430,822 times. The CO2 laser supersonic drawing is a new method to make nanofiber without using any solvent or removing the second component. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

18 citations

Journal ArticleDOI
TL;DR: The optimization of a capacitively coupled plasma etching for the fabrication of a polysilicon waveguide with smooth sidewalls and low optical loss is demonstrated.
Abstract: In this paper, we demonstrate the optimization of a capacitively coupled plasma etching for the fabrication of a polysilicon waveguide with smooth sidewalls and low optical loss. A detailed experimental study on the influences of RF plasma power and chamber pressure on the roughness of the sidewalls of waveguides was conducted and waveguides were characterized using a scanning electron microscope. It was demonstrated that optimal combination of pressure (30 mTorr) and power (150 W) resulted in the smoothest sidewalls. The optical losses of the optimized waveguide were 4.1±0.6 dB/cm.

18 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of the recess length in swirl coaxial injectors on heat transfer in a combustion chamber with cooling channels were investigated, and it was found that the longer recess length gradually increased the heat flux in the combustion chamber.

18 citations

Journal ArticleDOI
TL;DR: In this article, the authors proposed indirect methods to estimate dynamic forces that are transmitted by a fixed or free decoupler type hydraulic engine mount to a rigid base using a quasi-linear model.
Abstract: This article proposes indirect methods to estimate dynamic forces that are transmitted by a fixed or free decoupler type hydraulic engine mount to a rigid base. First, the linear system transfer functions that relate the force transmitted to the top chamber pressure and excitation displacement are derived in the Laplace and frequency domains; these clearly identify the roles of rubber and hydraulic force paths up to 50 Hz. Since hydraulic mounts are inherently nonlinear, a quasi-linear model is developed that incorporates amplitude-sensitive and spectrally-varying parameters such as top chamber compliance and rubber path properties (stiffness and damping). Alternate schemes based on a quasi-linear fluid system formulation work well as dynamic force spectra over a range of harmonic displacement excitations are successfully predicted given motion and/or pressure measurements; these compare well with measured forces over a range of frequencies and excitation amplitudes. In particular, the force to pressure transfer function model is quite promising. Conversely, the analogous mechanical system model fails as it yields highly inaccurate forces. The force time history is also briefly predicted by applying the Fourier expansion with an embedded quasi-linear fluid model with only the fundamental (excitation) frequency.

18 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202322
202257
202167
202086
201991
201882