scholarly journals Effects of dynamic flow rates on degradation deposition behavior of Mg scaffold

2021 ◽  
Author(s):  
Gaozhi Jia ◽  
Meng Zhou ◽  
Yicong Huang ◽  
Chenxin Chen ◽  
Liang Jin ◽  
...  
Keyword(s):  
Dynamic Flow ◽  
Flow Rates ◽  
Deposition Behavior

scholarly journals Effect of different biofuels on common rail injector flow rate

2017 ◽  
Vol 171 (4) ◽  
pp. 39-43
Author(s):  
Arkadiusz RYBAK ◽  
Jacek HUNICZ ◽  
Paweł KRZACZEK ◽  
Wojciech GOLIMOWSKI ◽  
Damian MARCINKOWSKI
Keyword(s):  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Injection Pressure ◽  
Common Rail ◽  
Dynamic Flow ◽  
Flow Rates ◽  
Used Cooking Oil ◽  
Acid Methyl ◽  
Common Rail Injector

In this study dynamic flow rates of a common rail injector using diesel fuel and different biofuels were determined. As biofuels, fatty acid methyl esters originating from canola, poultry, cattle and used cooking oil were tested. The tested fuels exhibited different physical properties e.g. density and viscosity. Measurements of the injector delivery rates were performed on a test stand designed for determination of injectors and injection pumps characteristics. Each fuel was tested at temperatures between 30 and 60°C, under injection pressure in the range of 30–180 MPa and injection time in the range of 200–1600 microseconds. The results showed differences in injector flow rates depending on used fuel, however different fuel properties affected amount of fuel injected especially at short injection durations.

scholarly journals PiFlow: A Biocompatible Low-Cost Programmable Dynamic Flow Pumping System Utilizing a Raspberry Pi Zero and Commercial Piezoelectric Pumps

2017 ◽  
Author(s):  
Timothy Kassis ◽  
Paola M. Perez ◽  
Chloe J. W. Yang ◽  
Luis R. Soenksen ◽  
David L. Trumper ◽  
...  
Keyword(s):  
Low Cost ◽  
Raspberry Pi ◽  
Dynamic Flow ◽  
Flow Rates ◽  
Use Of Time ◽  
Pumping System ◽  
Cellular Environment ◽  
Cell Culture Systems ◽  
Peristaltic Pumps ◽  
3D Printed

AbstractWith the rise of research utilizing microphysiological systems (MPSs), the need for tools that enable the physiological mimicking of the relevant cellular environment is vital. The limited ability to reproduce crucial features of the microenvironment, such as surrounding fluid flow and dynamic changes in biochemical stimuli, severely limits the types of experiments that can be carried out. Current equipment to achieve this, such as syringe and peristaltic pumps, is expensive, large, difficult to program and has limited potential for scalability. Here, we present a new pumping platform that is open-source, low-cost, modular, scalable, fully-programmable and easy to assemble that can be incorporated into cell culture systems to better recapitulate physiological environments. By controlling two commercially available piezoelectric pumps using a Raspberry Pi Zero microcontroller, the system is capable of producing arbitrary dynamic flow profiles with reliable flow rates ranging from 1 to 3,000 µL/min as specified by an easily programmable Python-based script. We validated the accuracy of the flow rates, the use of time-varying profiles, and the practicality of the system by creating repeatable dynamic concentration profiles using a 3D-printed static micromixer.

scholarly journals A pathway to eliminate the gas flow dependency of a hydrocarbon sensor for automotive exhaust applications

2018 ◽  
Vol 7 (1) ◽  
pp. 79-84 ◽  
Author(s):  
Gunter Hagen ◽  
Antonia Harsch ◽  
Ralf Moos
Keyword(s):  
Gas Sensors ◽  
Gas Flow ◽  
Dynamic Flow ◽  
Cross Effect ◽  
Correct Position ◽  
Present Contribution ◽  
Flow Rates ◽  
Flow Dependency ◽  
Reduce Emissions ◽  
Exothermic Oxidation

Abstract. Gas sensors will play an essential role in future combustion-based mobility to effectively reduce emissions and monitor the exhausts reliably. In particular, an application in automotive exhausts is challenging due to the high gas temperatures that come along with highly dynamic flow rates. Recently, a thermoelectric hydrocarbon sensor was developed by using materials which are well known in the exhausts and therefore provide the required stability. As a sensing mechanism, the temperature difference that is generated between a catalytically activated area during the exothermic oxidation of said hydrocarbons and an inert area of the sensor is measured by a special screen-printed thermopile structure. As a matter of principle, this thermovoltage significantly depends on the mass flow rate of the exhausts under certain conditions. The present contribution helps to understand this cross effect and proposes a possible setup for its avoidance. By installing the sensor in the correct position of a bypass solution, the gas flow around the sensor is almost free of turbulence. Now, the signal depends only on the hydrocarbon concentration and not on the gas flow. Such a setup may open up new possibilities of applying novel sensors in automotive exhausts for on-board-measurement (OBM) purposes.

Influence of Dynamic Flow Speed on Bonelike Apatite Formation in Porous Calcium Phosphate Ceramic in RSBF

2005 ◽  
Vol 288-289 ◽  
pp. 273-276
Author(s):  
Chun Lin Deng ◽  
Ji Yong Chen ◽  
Hong Song Fan ◽  
Xing Dong Zhang
Keyword(s):  
Fourier Transform ◽  
Flow Rate ◽  
Thick Layer ◽  
Flow Speed ◽  
Apatite Formation ◽  
Crystal Shape ◽  
Dynamic Flow ◽  
Calcium Phosphate Ceramic ◽  
Flow Rates ◽  
Bonelike Apatite

A revised dynamic immersion device was designed, and the effects of flowing speed of SBF in inner pores of ceramics on the formation of apatite in the pores were investigated in this study. The results showed some crystals were overlaid on the walls of inner pores. The crystal shape changed with flow rate of RSBF. When flow rates of RSBF were 2 ml/min, some stamen-like crystals formed on the inner walls of ceramics. In the ceramics in RSBF with flow rate of 5ml/min, besides more stamen -like crystals, a thin layer of fine deposits was overlaid on the walls of inner holes and the surface of the stamen -like crystals. But when the flow rate was 8 ml/min, only a thick layer of fine deposits on the walls of inner pores could be found. Energy dispersive spectroscopy (EDS) and Fourier Transform Infrared spectroscopy (FTIR) results revealed the deposits obtained in this study are carbonate hydroxyapatite (CHA).

Dynamic flow rates of granular particles

1979 ◽  
Vol 23 (1) ◽  
pp. 79-84 ◽  
Author(s):  
J.T. Carstensen ◽  
S.M. Laughlin
Keyword(s):  
Dynamic Flow ◽  
Flow Rates ◽  
Granular Particles

Automation of Process Control in Chemical Plant

2015 ◽  
Vol 2 (1) ◽  
pp. 6-12
Author(s):  
Agus Sugiarta ◽  
Houtman P. Siregar ◽  
Dedy Loebis
Keyword(s):  
Process Control ◽  
Pid Control ◽  
Control Algorithm ◽  
Chemical Engineering ◽  
Chemical Plant ◽  
Raw Material ◽  
Flow Rates ◽  
Material Supply ◽  
Wide Range ◽  
Inherent Problem

Automation of process control in chemical plant is an inspiring application field of mechatronicengineering. In order to understand the complexity of the automation and its application requireknowledges of chemical engineering, mechatronic and other numerous interconnected studies.The background of this paper is an inherent problem of overheating due to lack of level controlsystem. The objective of this research is to control the dynamic process of desired level more tightlywhich is able to stabilize raw material supply into the chemical plant system.The chemical plant is operated within a wide range of feed compositions and flow rates whichmake the process control become difficult. This research uses modelling for efficiency reason andanalyzes the model by PID control algorithm along with its simulations by using Matlab.

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