Abstract The paper presents the results of experiments on measuring heat transfer in laminar-wave films R114/R21 refrigerant mixture flowing down a vertical plate (70 × 80 mm). were carried out saturation line at pressure 2 bar. To enhance transfer, porous copper coating with flat layer thickness 400 μm and porosity 45% was applied to heat-transfer surface by 3D printing. effectiveness applicat...

The recent detection of interstellar polarization in the solid CO feature near 4.67μm shows that CO-mantled grains can be aligned in cold molecular clouds. These observations conflict with a theory of grain alignment which attributes the polarization in molecular clouds to the effects of cosmic rays: according to this theory, oblate spheroidal grains with H2Oand CO2-dominated ice mantles are sp...

This paper presents the third in a series of single-dish studies of molecular abundances in the envelopes around a large sample of 18 low-mass pre-and protostellar objects. It focuses on typical grain mantle products and organic molecules, including H 2 CO, CH 3 OH and CH 3 CN. With a few exceptions, all H 2 CO lines can be fit by constant abundances of 7×10 −11 – 8×10 −9 throughout the envelop...

Purpose – The paper’s aim is to show the development of materials and methods which allow freeform fabrication of macroscopic Zn-air electrochemical batteries. Freedom of geometric design may allow for new possibilities in performance optimization. Design/methodology/approach – The authors have formulated battery materials which are compatible with solid freeform fabrication (SFF) while retaini...

Molecular dynamics simulations are used to study the evaporation of water droplets containing either dissolved LiCl, NaCl or KCl salt in a gaseous surrounding (nitrogen) with a constant high temperature of 600 K. The initial droplet has 298 K temperature and contains 1,120 water molecules, 0, 40, 80 or 120 salt molecules. The effects of the salt type and concentration on the evaporation rate ar...

Water-floating carbon nanotube thermoelectric generators (CNT-TEGs) can effectively power Internet of Things (IoT) applications. CNT-TEGs produce electricity by floating on water to generate a temperature gradient in the CNT films, where pumping via capillary action causes evaporation-induced cooling selected areas. However, amount required for target applications needs be increased. Therefore,...

Debris rings of dust are found around young luminous stars such as HR4796A and HD141569. Some of these entities have sharp edges and gaps which have been interpreted as evidence for the presence of shepherding and embedded planets. Here we show that gaps and sharp edges in the debris disks of dust can also be spontaneously self generated if they are embedded in optically thin regions of gaseous...

We present a calculation of the sedimentation of grains in a giant gaseous protoplanet such as that resulting from a disk instability of the type envisioned by Boss (1998). Boss (1998) has suggested that such protoplanets would form cores through the settling of small grains. We have tested this suggestion by following the sedimentation of small silicate grains as the protoplanet contracts and ...

The recent detection of interstellar polarization in the solid CO feature near 4.67μm shows that CO-mantled grains can be aligned in cold molecular clouds. These observations conflict with a theory of grain alignment which attributes the polarization in molecular clouds to the effects of cosmic rays: according to this theory, oblate spheroidal grains with H2Oand CO2-dominated ice mantles are sp...