Internally ribbed tubes (IRTs) with better heat transfer capability have been widely applied in many fields. Several studies focused on the flow and IRTs special structure configurations, but there is still lack of clear understanding regarding influence spiral ribs/grooves local supercritical water. In present paper, numerical simulation turbulent water through a vertically upward investigated...

A model of the chest and lungs can be easily constructed from a bottle of water, a balloon, a syringe, a rubber stopper, glass and rubber tubing, and clamps. The model is a more exact analogue of the body than the classic apparatus of Hering in two respects: 1) the pleurae and intrapleural fluid are represented by water rather than air, and 2) the subatmospheric "intrapleural" pressure is creat...

During the last 5 years JPL has examined a number of concepts 2 for robotically controlled balloons or aerobots. The Venus Geoscience Aerobot (VGA) concept uses reversible fluid altitude control to carry out repeated descents to the surface of Venus. This concept uses frozen water to keep the electronics cool. The balloon must periodically go to high altitude so that the water can be refrozen. ...

We demonstrate how phyllotaxis (the arrangement of leaves on plants) and the ribbed, hexagonal, or parallelogram planforms on plants can be understood as the energy-minimizing buckling pattern of a compressed sheet (the plant's tunica) on an elastic foundation. The key idea is that the elastic energy is minimized by configurations consisting of special triads of periodic deformations. We study ...

The present work is carried out to investigate heat transfer and friction factor characteristics of fluid (air) flow through turbulent channel i.e. parallel plate heat exchanger for different geometry and designs parameters, with a bottom plate applied to uniform constant heat flux thermal boundary condition, and upper plate is provided with a insulated condition. The fluid domain is designed u...

Flow characteristics and heat transfer performances of carboxymethyl cellulose (CMC) aqueous solutions in the microchannels with flow control structures were investigated in this study. The researches were carried out with various flow rates and concentrations of the CMC aqueous solutions. The results reveal that the pin-finned microchannel has the most uniform temperature distribution on the s...

In the hen, injection of either vasotocin or oxytocin caused expulsion of the egg 1 to 20 hr prematurely (Rzasa & Ewy, 1970). The effect of these hormones on pressure within the uterus (shell gland) is reported. Fifteen New Hampshire, laying hens (no egg in utero) were used. Hens were anaesthetized with sodium phenobarbitone (160 mg/kg) injected i.m. Intrauterine pressure was recorded on a kymo...

Abstract. This paper presents a part from one broader research project on ribbed vaults. The main goal is to generate parametric objects library for vaults, suitable both HBIM system, structural analysis or Cultural Heritage dissemination. Starting Treatises study we have analyzed different classification system and terminology used vaults components in languages, especially English, French, Sp...