Off-The-Shelf Variable Flow Rate Water-Propylene Glycol Hydraulics

Abstract In the differential equation of variable flow rate fluid flow a component which takes into account outer hydrodynamic pressure is introduced. The variables of the equation are expressed in terms of full operating head and in terms of independent distance along the axis of the stream, i. e. this equation is reduced to a singlevariable equation.

Download Full-text

Automatic titrations in unsegmented flow systems based on variable flow-rate patterns

Analytica Chimica Acta ◽

10.1016/0003-2670(92)80230-5 ◽

1992 ◽

Vol 261 (1-2) ◽

pp. 489-494 ◽

Cited By ~ 37

Author(s):

J. Marcos ◽

A. íos ◽

M. Valcárcel

Keyword(s):

Flow Rate ◽

Variable Flow ◽

Flow Systems

Download Full-text

VARIABLE VOLUME, VARIABLE FLOW RATE, RADIATION CONTROLLED SOLAR HEATING AND STORAGE

Intersol Eighty Five ◽

10.1016/b978-0-08-033177-5.50027-2 ◽

1986 ◽

pp. 98-102 ◽

Cited By ~ 1

Author(s):

L.F. Jesch ◽

T.W. Greeves ◽

L. Jankovic

Keyword(s):

Flow Rate ◽

Solar Heating ◽

Variable Flow ◽

Variable Volume ◽

And Storage

Download Full-text

Relative Volatilities of Ester and Amine Forms of 2,4-D

Weed Science ◽

10.1017/s0043174500065358 ◽

1976 ◽

Vol 24 (1) ◽

pp. 26-28 ◽

Cited By ~ 9

Author(s):

R. Grover

Keyword(s):

Gas Chromatography ◽

Acetic Acid ◽

Ethylene Glycol ◽

Propylene Glycol ◽

Flow Rate ◽

Flow System ◽

Butyl Ether ◽

Technical Grade ◽

Dichlorophenoxy Acetic Acid ◽

Amine Salts

The relative volatilities of various technical and formulated ester and amine salts of 2,4-D [(2,4-dichlorophenoxy)acetic acid] were determined in a closed air-flow system consisting of a volatilization chamber and an ethylene glycol trap. The system was operated at a flow rate of 28.8 L/hr and a temperature of 30 C. Trapped herbicide vapor was analyzed by gas chromatography. The relative volatilities of technical gradeiso-propyl, butyl, propylene glycol butyl ether, andiso-octyl esters, were 56, 25 to 38, 4, and 1, respectively. The relative volatilities of various formulated esters and amines were of the magnitude of 440:33:1 for the high volatile, low volatile, and amine salts, respectively.

Download Full-text

Comparison of heat transfer performance of ZnO-PG, α-Al2O3-PG, and γ-Al2O3-PG nanofluids in car radiator

Nanomaterials and Nanotechnology ◽

10.1177/1847980419876465 ◽

2019 ◽

Vol 9 ◽

pp. 184798041987646 ◽

Cited By ~ 3

Author(s):

XiaoRong Zhou ◽

Yi Wang ◽

Kai Zheng ◽

Haozhong Huang

Keyword(s):

Heat Transfer ◽

Heat Transfer Coefficient ◽

Transfer Coefficient ◽

Propylene Glycol ◽

Flow Rate ◽

Volume Concentration ◽

Maximum Heat ◽

Cooling Performance ◽

Maximum Heat Transfer ◽

The Heat Transfer Coefficient

In this study, the cooling performance of nanofluids in car radiators was investigated. A car radiator, temperature measuring instrument, and other components were used to set up the experimental device, and the temperature of nanofluids passing through the radiator was measured by this device. Three kinds of nanoparticles, γ-Al2O3, α-Al2O3, and ZnO, were added to propylene glycol to prepared nanofluids, and the effects of nanoparticle size and type, volume concentration, initial temperature, and flow rate were tested. The results indicated that the heat transfer coefficients of all nanofluids first increased and then decreased with an increase in volume concentration. The ZnO-propylene glycol nanofluid reached a maximum heat transfer coefficient at 0.3 vol%, and the coefficient decreased by 25.6% with an increase in volume concentration from 0.3 vol% to 0.5 vol%. Smaller particles provided a better cooling performance, and the 0.1 vol% γ-Al2O3-propylene glycol nanofluid had a 19.9% increase in heat transfer coefficient compared with that of α-Al2O3-propylene glycol. An increase in flow rate resulted in a 10.5% increase in the heat transfer coefficient of the 0.5 vol% α-Al2O3-propylene glycol nanofluid. In addition, the experimental temperature range of 40–60°C improved the heat transfer coefficient of the 0.2 vol% ZnO-propylene glycol nanofluid by 46.4%.

Download Full-text