نتایج جستجو برای: helical tube

تعداد نتایج: 119987  

Journal: :Journal of Thermal Engineering 2021

The paper investigates the heat transfer characteristics of exchanger under two different configurations namely taper helical tube and spiral type exchanger. working fluid is water which flows in tubes kept horizontally mass flow rate ranges from 0.04 kg/s to 0.16 kg/s. effect configuration parameters Reynolds number on coefficient Nusselt were studied. Regression equations have been developed ...

Journal: :Journal of the Japan Society for Technology of Plasticity 2006

Journal: :Journal of Thermal Engineering 2022

The present investigations put forth the development of a novel double wall vented rotary fluid heating device. In this device, water is used as process and heated by combustion sugarcane bagasse. proposed method found to provide use more systematic fuel transport system ensure efficient heat transfer fluid. It observed offer many advantages over conventional furnaces obviates any mechanized su...

Journal: :Physics of Fluids 2023

Pressure fluctuations in the draft tube mainly arise from rotational motion of vortex rope. The formation and development rope are significantly influenced by cavitation. However, precise mechanism underlying progression cavitation its initial weak state to a more severe level remains unclear. objective this study is investigate pump-turbine operating under part load turbine conditions. Numeric...

1999
Y. FAN E. G. ZWEIBEL M. G. LINTON G. H. FISHER

We perform three-dimensional simulations of the rise of twisted magnetic Ñux tubes in an adiabatically stratiÐed model solar convection zone. The initial Ñux tube in our simulations is a uniformly twisted, buoyant, horizontal tube located near the bottom of the stratiÐed layer. The twist of the initial Ñux tube is described by a parameter a, which is deÐned as the angular rate of Ðeld-line rota...

2013
Pavel Ryska Tomas Kvasnicka Jiri Jandura Ludovit Klzo Jakub Grepl Jan Zizka

Aims. To compare the effective and eye lens radiation dose in helical MDCT brain examinations using automatic tube current modulation in conjunction with either standard filtered back projection (FBP) technique or iterative reconstruction in image space (IRIS). Methods. Of 400 adult brain MDCT examinations, 200 were performed using FBP and 200 using IRIS with the following parameters: tube volt...

Journal: :Monthly Notices of the Royal Astronomical Society 2022

ABSTRACT Magnetoacoustic waves in solar magnetic flux tubes may be affected by the presence of background rotational flows. Here, we investigate behaviour m = 0 and ±1 modes a tube linear flows embedded photospheric environment. We show that inclusion flow is found to have little effect on obtained eigensolutions for axisymmetric sausage mode. However, solutions kink mode are dependent location...

2014
Pavel Ryska Tomas Kvasnicka Jiri Jandura Ludovit Klzo Jakub Grepl Jan Zizka

Aims. To compare the effective and eye lens radiation dose in helical MDCT brain examinations using automatic tube current modulation in conjunction with either standard filtered back projection (FBP) technique or iterative reconstruction in image space (IRIS). Methods. Of 400 adult brain MDCT examinations, 200 were performed using FBP and 200 using IRIS with the following parameters: tube volt...

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