Experimental investigation on suppression of thermal stratification in large water pool using seven shroud arrangement

2019 ◽  
Author(s):  
Rohit Gaikwad ◽  
Ramakant Shrivastava ◽  
P. K. Verma
Keyword(s):  
Experimental Investigation ◽  
Thermal Stratification ◽  
Water Pool ◽  
Large Water

On the Use of Monolayers to Reduce Evaporation From Stationary Water Pools

1993 ◽  
Vol 115 (1) ◽  
pp. 209-214 ◽  
Author(s):  
T. D. Tang ◽  
M. T. Pauken ◽  
S. M. Jeter ◽  
S. I. Abdel-Khalik
Keyword(s):  
Experimental Investigation ◽  
Relative Humidity ◽  
Water Surface ◽  
Surface Film ◽  
Free Water ◽  
Vapor Concentration ◽  
Controlled Environment ◽  
Stearyl Alcohol ◽  
Water Pool ◽  
Evaporation Suppression

An experimental investigation has been conducted to quantify the extent by which monolayers of fatty alcohols can reduce evaporation from a deep stationary water pool within a controlled environment. Octadecanol (stearyl alcohol), C17H35–CH2–OH, was chosen as the surface film and ethanol was selected to be the spreading agent. Evaporation suppression of 60 percent was achieved at a water temperature of 25°C with an air temperature of 20°C and a relative humidity of 70 percent. The experimental techniques and data have been validated by comparing the measured evaporation rates for film-free water with earlier data published by other investigators. Data for the evaporation rates of water covered by octadecanol films were correlated as a function of vapor concentration differences between the water surface and air.

Experimental Investigation of Stresses in Winch Drums Subjected to Multilayer Spooling Loads From Synthetic Fibre Ropes

2019 ◽  
Author(s):  
Reidar André Skarbøvik ◽  
Henry Piehl ◽  
Sverre Torben ◽  
Mette Lokna Nedreberg ◽  
Vilmar Æsøy
Keyword(s):  
Experimental Investigation ◽  
High Performance ◽  
Synthetic Fibre ◽  
Steel Wire ◽  
High Strength ◽  
Wire Rope ◽  
First Results ◽  
Large Water ◽  
Marine Applications ◽  
And Control

Abstract In many marine applications, modern high-performance synthetic fibre ropes have replaced, and are continuing to replace, well-known steel wire rope solutions due to the low weight of the synthetic ropes removing limitations for operations at large water depths. In some cases, replacement of steel wires with synthetic ropes has caused permanent deformations and damage to multilayer winch drums, indicating that synthetic fibre ropes can cause larger pressure on winch drums than steel wire. This paper presents the first results from a novel experimental investigation of a multilayer winch subjected to a selection of braided high-performance synthetic fibre ropes and a reference steel wire rope. The tested ropes, with nominal diameters between 12 and 20mm, are spooled at different tensile loads and with maximum number of layers in the range of 10 to 19. The experiments utilize a test rig with two winch drums, controllable spooling gear and sheaves with load cells to apply and control required load and speed during spooling. Measurements from twelve biaxial strain gauges on the inside of a thick high-strength drum are used to measure stresses in the structure. The results show that the selected fibre ropes induce considerably larger stress in the winch drum than the steel wire rope. This confirms that design of multilayer winch drums with high-performance synthetic fibre ropes requires special considerations and that the guidance for multilayer stress calculations, related to steel wire ropes, in DNV-GL-0378 “Standard for offshore and platform lifting appliances” is not applicable for synthetic fibre rope applications.

Experimental investigation of thermal stratification subject to multi-species ullage

2020 ◽  
Vol 45 (1) ◽  
pp. 46-51
Author(s):  
Mebin Abraham Cherian ◽  
Jeswin Joseph ◽  
Gagan Agrawal ◽  
Deepak K. Agarwal ◽  
T. John Tharakan ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Thermal Stratification

Steam Jet Condensation in a Pool: From Fundamental Understanding to Engineering Scale Analysis

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Chul-Hwa Song ◽  
Seok Cho ◽  
Hyung-Seok Kang
Keyword(s):  
Thermal Stratification ◽  
Hot Spot ◽  
Global Analysis ◽  
Turbulent Jet ◽  
Local Behavior ◽  
Dynamic Features ◽  
Water Pool ◽  
Thermal Mixing ◽  
Fundamental Understanding ◽  
Contact Condensation

The phenomena of direct contact condensation (DCC) of a steam jet submerged in a water pool occur because of the actuation of steam discharging devices in many industrial processes. There are practically two kinds of technical concerns to consider. The first is the thermal mixing in the water pool, and the other is the thermo-hydraulically induced mechanical loads acting on the structures of relevant systems. The two concerns are inter-related and can be well described only if the local behavior of the condensing steam jets and the resultant turbulent jet in a pool are well understood. In this paper, the DCC-related thermofluid dynamic features are discussed focusing on these two concerns. The fundamental characteristics of condensing steam jets are discussed, including the local behavior of condensing jets and the resultant turbulent jet, both of which importantly affect the macroscopic circulation in a pool. Then, a global analysis of thermal mixing in a pool from the viewpoints of the local hot spot and the thermal stratification are discussed with practical application to engineering design in mind.

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