Results 31 to 40 of about 462,633 (304)

Proposing the employment of spring-wire turbulator for flat spiral tubes utilized in solar ponds, experimental study

open access: yesCase Studies in Thermal Engineering, 2022
Flat horizontal spiral-tube is an ideal sort of heat exchangers applicable in solar ponds as it is placed in the hottest zone (bottom of the pond) with the maximum coverage area to transfer the heat into the secondary fluid flow.
Fayez Aldawi
doaj   +1 more source

Constraining Monopoles by Topology: an Autonomous System [PDF]

open access: yes, 2014
We find both analytical and numerical solutions of SU(2) Yang-Mills with an adjoint Higgs field within both closed and open tubes whose sections are spherical caps. This geometry admits a smooth limit in which the space-like metric is flat and, moreover,
Canfora, Fabrizio, Tallarita, Gianni
core   +2 more sources

Numerical Simulation of Flow and Heat Transfer Characteristics of CuO-Water Nanofluids in a Flat Tube

open access: yesFrontiers in Energy Research, 2018
In this paper, water and CuO-water nanofluids are selected as working fluids. The characteristics of fluid flow and heat transfer in a heat transfer tube are analyzed by means of numerical simulation. The effect of nanofluid concentration on the flow and
Luchao She, Guangming Fan
doaj   +1 more source

Building-integrated solar thermal systems based on vacuum-tube technology: Critical factors focusing on life-cycle environmental profile [PDF]

open access: yes, 2016
The present study refers to Building-Integrated Solar Thermal (BIST) systems based on vacuum-tube collectors and it consists of two parts. In the first part, a literature review is presented, including studies about vacuum-tube technology (vacuum-tube ...
Canaletti, J. L.   +3 more
core   +2 more sources

Magnetic flux tube models in superstring theory [PDF]

open access: yes, 1995
Superstring models describing curved 4-dimensional magnetic flux tube backgrounds are exactly solvable in terms of free fields. We first consider the simplest model of this type (corresponding to `Kaluza-Klein' Melvin background).
A.A Tseytlin   +58 more
core   +2 more sources

Numerical Analyses of the Influences of Connector Structures on the Performance of Flat-Tube SOFC

open access: yesApplied Sciences
This study investigates how three flat-tube connector structures—conventional, ribbed flat-tube, and flange-connected—affect solid oxide fuel cell (SOFC) performance.
Jian Yao, Xueyan Guo
doaj   +1 more source

Fabrication of tube-embedded cooling channel through press-fit and directed energy deposition

open access: yesJournal of Materials Research and Technology
Thermoplastic polymeric products are widely used in everyday life; the quality of their molded parts is substantially affected by the cooling characteristics of the mold. This study proposes fabricating a cooling channel through tube embedding inside the
Hyun-Tae Park   +3 more
doaj   +1 more source

X-ray measurements of growth rates at a gas interface accelerated by shock waves [PDF]

open access: yes, 1996
A new experimental technique to measure the density of a high atomic number gas at a shock-accelerated interface has been developed and demonstrated.
Bonazza, R., Sturtevant, B.
core   +1 more source

Prediction and Optimization of Wear Depth on Rectangular Tube Surface in Roll Forming

open access: yesMetals, 2022
The outer surface of the tube is worn under the interaction between the velocity difference and rolling pressure, in the process of rolling the circular tube into a rectangular tube. In order to predict the wear depth, according to the characteristics of
Menglong Xing   +5 more
doaj   +1 more source

Numerical analysis of a flat plate collector using different types of parallel tube geometry

open access: yesAIP Advances, 2023
To obtain improved thermal performance of flat plate solar collectors, the effect of square and rectangular riser tubes of a flat plate collector (FPC) were numerically investigated and compared with circular riser tube FPC in the present study. For this
Rafiqul Islam   +4 more
doaj   +1 more source

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