Accurate calibration is imperative to obtain reliable flow measurements using hot-wire anemometry. Calibration errors owing to temperature drift, wire degradation, changes in ambient conditions etc can lead to substantial uncertainties in hot-wire measurements. A new calibration procedure is implemented here to account for most forms of drift that are typically encountered during high quality f...

We show that a quantum wire device with spin splitting can work as an active spin polarizer. Hot electrons in one ‘spin’ subband (e.g. ‘spin-up’) may pass such a device with weak electron pair scattering, while electrons in the opposite subband (‘spindown’) may have high conversion probability into the ‘spin-up’ subband, resulting in spin polarization of a hot electron beam. Under different cir...

Absolute measurements of the thermal conductivity of a distilled and dried sample of toluene near saturation are reported. The transient hot-wire technique with an anodized tantalum hot wire was used. The thermal conductivities were measured at temperatures from 300 K to 550 K at different applied power levels to assess the uncertainty with which it is possible to measure liquid thermal conduct...

In this study, we tried to improve the performance by giving a pre-swirling flow radial inflow that occurred in semi-opened axial fan. addition, fields of rotor outlet were clarified experimentally, and effect was considered. The experiment carried out using test wind tunnel with square cross section 880 mm. Three types casings prepared, which blade tip protruded 0%, 20%, 40% meridional chord l...

Turbulent burning velocity is one of the most relevant parameters to characterize premixed turbulent flames. Different correlation has been proposed estimate this parameter. However, them have obtained using experimental data at atmospheric pressure or higher. The present study focused on obtaining a for sub-atmospheric pressure. was experimentally calculated burner method, where premix flames ...

Aim of study: Selecting a proper fan for the rice combine harvesters to get good cleaning performance when harvesting high yield rice. Area Jiangsu Province, China.Material and methods: Three potential multi-duct fans were designed, computational fluid dynamics hot wire anemometer technology utilized learn airflow pressure variation inside with perforated plates at outlet ducts as loads. Then, ...

Abstract The work is devoted to the development of a new experimental method for entering controlled disturbances with given frequency-wave structure into supersonic boundary layer. Experimental data on formation from two pulsed sources (pulsed glow discharge) in laminar flat-plate layer at Mach number equal 2 are given. experiments were carried out T-325 wind tunnel ITAM SB RAS. localized spac...

Energy expenditure during flight in animals can best be understood and quantified when both theoretical and empirical approaches are used concurrently. This paper examines one of four methods that we have used to estimate the cost of flight in a neotropical nectar-feeding bat Glossophaga soricina (Phyllostomidae), namely the use of kinematic and morphological data and aerodynamic theory to esti...

The wind-sensitive cercal system, well-known for mediating terrestrial escape responses, may also mediate insect aerial bat-avoidance responses triggered by wind generated by the approaching bat. One crucial question is whether enough time exists between detection and capture for the insect to perform a successful evasive maneuver. A previous study estimated this time to be 16 ms, based on cock...

BACKGROUND We need a sensor to measure the convective heat transfer coefficient during ablation of the heart or liver. METHODS We built a minimally invasive instrument to measure the in vivo convective heat transfer coefficient, h in animals, using a Wheatstone-bridge circuit, similar to a hot-wire anemometer circuit. One arm is connected to a steerable catheter sensor whose tip is a 1.9 mm x...