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Topic

Airflow

About: Airflow is a research topic. Over the lifetime, 60061 publications have been published within this topic receiving 448031 citations. The topic is also known as: air flow.


Papers
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Journal ArticleDOI
06 Apr 2001-Science
TL;DR: The formation of a three-dimensionally ordered array of air bubbles of monodisperse pore size in a polymer film through a templating mechanism based on thermocapillary convection is reported.
Abstract: We report the formation of a three-dimensionally ordered array of air bubbles of monodisperse pore size in a polymer film through a templating mechanism based on thermocapillary convection. Dilute solutions of a simple, coil-like polymer in a volatile solvent are cast on a glass slide in the presence of moist air flowing across the surface. Evaporative cooling and the generation of an ordered array of breath figures leads to the formation of multilayers of hexagonally packed water droplets that are preserved in the final, solid polymer film as spherical air bubbles. The dimensions of these bubbles can be controlled simply by changing the velocity of the airflow across the surface. When these three-dimensionally ordered macroporous materials have pore dimensions comparable to the wavelength of visible light, they are of interest as photonic band gaps and optical stop-bands.

865 citations

Journal ArticleDOI
TL;DR: In this paper, thin-layer drying characteristics of garlic slices (2-4 mm) were investigated for a temperature range 50-90 °C, a relative humidity range 8-24%, and an airflow range 0.5-1 m/s.

808 citations

Book
01 Jan 1996
TL;DR: Tracer gas techniques for measuring age distribution and ventilation efficiency are described in this paper. But they are not suitable for the measurement of large internal openings, as shown in Figure 1.
Abstract: Partial table of contents: Flow Through Envelope Openings. Basic Mechanisms of Mass Transport Within Buildings. Momentum and Buoyancy Induced Primary Air Flows. Flows in Rooms. Flow Through Large Internal Openings. Tracer Gas Techniques for Ventilation Rate Measurements. Tracer Gas Techniques for Measuring Age Distribution and Ventilation Efficiency. Index.

708 citations

Journal ArticleDOI
TL;DR: In this paper, Jive k-e, two-equation models are evaluated for their performance in predicting natural convection, forced convection and mixed convection in rooms, as well as an impinging jet flow.
Abstract: In this article, Jive k-e, two-equation models are studied: the standard k-e model, a low-Reynolds-number k-e model, a two-layer k-e model, a two-scale k-e model, and a renormalization group (RNG) k-e model. They are evaluated for their performance in predicting natural convection, forced convection, and mixed convection in rooms, as well as an impinging jet flow. Corresponding experimental data from the literature are used for validation. It is found that the prediction of the mean velocity is more accurate than that of the turbulent velocity. These models are neither able to predict anisotropic turbulence correctly nor to pick up the secondary recirculation of indoor air flow; otherwise the performance of the standard k-e model is good. The RNG k-e model is slightly better than the standard k-e model and is therefore recommended for simulations of indoor airflow. The performance of the other models is not stable.

686 citations

Journal ArticleDOI
TL;DR: Recordings of productions of syllable sequences in soft, normal, and loud voice showed that with change from normal to loud voice, both males and females produced loud voice with increased pressure, accompanied by increased ac flow and increased maximum airflow declination rate.
Abstract: Measurements on the inverse filtered airflow waveform (the "glottal waveform") and of estimated average transglottal pressure and glottal airflow were made from noninvasive recordings of productions of syllable sequences in soft, normal, and loud voice for 25 male and 20 female speakers. Statistical analyses showed that with change from normal to loud voice, both males and females produced loud voice with increased pressure, accompanied by increased ac flow and increased maximum airflow declination rate. With change from normal voice, soft voice was produced with decreased pressure, ac flow and maximum airflow declination rate, and increased dc and average flow. Within the loudness conditions, there was no significant male-female difference in air pressure. Several glottal waveform parameters separated males and females in normal and loud voice. The data indicate higher ac flow and higher maximum airflow declination rate for males. In soft voice, the male and female glottal waveforms were more alike, and there was no significant difference in maximum airflow declination rate. The dc flow did not differ significantly between males and females. Possible relevance to biomechanical differences and differences in voice source characteristics between males and females and across loudness conditions is discussed.

616 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023981
20222,022
20211,381
20202,940
20193,364
20183,021