Showing papers by "Young I. Cho published in 2001"
Patent•
02 Jul 2001
TL;DR: In this article, an apparatus and method for determining the viscosity of a fluid over plural shear rates caused by a decreasing pressure differential by monitoring the movement of the fluid through a riser tube and a capillary tube is described.
Abstract: An apparatus and method for determining the viscosity of a fluid over plural shear rates caused by a decreasing pressure differential by monitoring the movement of the fluid through a riser tube and a capillary tube. The movement can be monitored by detecting the changing weight of the fluid, using a precision balance or load cell, as it moves through the riser tube and capillary tube into a fluid collector; or, alternatively, the movement can be monitored by detecting the changing level of a fluid column in the riser tube using a column level detector. A processor then uses the changing weight or height data, along with the dimensions of the capillary tube and a dimension of the riser tube, to determine the viscosity of the fluid. In addition, apparatus and methods for determining fluid viscosity online and fluid mixture homogeneity online are also described.
49 citations
Patent•
28 Jun 2001
TL;DR: In this article, a regenerative type of refrigeration system recirculates a mixture of R-134a, R-32 and R-125 through first and second series condensers.
Abstract: A regenerative type of refrigeration system recirculates a mixture of R-134a, R-32 and R-125 through first and second series condensers. In order to increase the concentration of the high-boiling point R-134a, the liquid output of a liquid-vapor separator receives a super-heated mixture vapor tapped from the output of the compressor. An adjustable valve controls the amount of the super heated mixture vapor which is injected to vary the concentration of R-134a in the recirculation line. Liquified R-134a passes through a secondary expansion valve and a secondary evaporator, reducing to an intermediate pressure, and enters a vortex tube, thus bypassing the main evaporator. Subsequently, the suction pressure of the compressor increases, increasing the EER of the refrigeration system. The recirculating concept is also applicable to a single refrigerant system.
41 citations
TL;DR: In this article, the effect of electronic anti-fouling (EAF) technology on fouling mitigation in a heat exchanger in an open cooling-tower system was investigated, and two tests were performed in a rectangular heat-transfer channel at 5 cycles of concentration: one without the EAF treatment and the other with the eAF treatment.
34 citations
Patent•
27 Dec 2001
TL;DR: In this article, a column monitor is provided that uses multiple interrogation sources and a single detector to continuously monitor both columns of fluid substantially simultaneously, and the system includes a Y-connector to form two flow paths and each flow path includes a tube that includes a riser tube, a capillary tube of predetermined dimensions and a valve in each for controlling the fluid flow in each path.
Abstract: An apparatus and method for measuring the viscosity of Newtonian and non-Newtonian fluids over a range of shear rates, especially low shear rates, by monitoring two rising columns of fluid (Newtonian or non-Newtonian) that pass through respective capillaries having different lengths. Furthermore, a specialized column monitor is provided that uses multiple interrogation sources (e.g., lasers) and a single detector (e.g., a charge-coupled device (CCD) array) to continuously monitor both columns of fluid substantially simultaneously. In particular, the system includes a Y-connector to form two flow paths and wherein each flow path includes a tube that includes a riser tube, a capillary tube of predetermined dimensions and a valve in each for controlling the fluid flow in each path. The specialized column monitor monitors the movement of the fluid columns in each of the riser tubes and an associated microprocessor analyzes these movements, along with the predetermined dimensions of the capillary tubes and riser tubes to determine the viscosity of the fluid.
25 citations
Patent•
08 Mar 2001
TL;DR: In this paper, a vortex generator restores the optimum operating condition in the refrigeration system with insufficient refrigerant charge or using an inverter compressor, thus yielding less than the maximum EER (energy efficiency ratio).
Abstract: The performance of a refrigeration system is often reduced due to insufficient refrigerant charge or due to the use of an inverter compressor. The performance loss is associated with the operating condition, which is not at the optimum, thus yielding less than the maximum EER (energy efficiency ratio). A vortex generator restores the optimum operating condition in the refrigeration system with insufficient refrigerant charge or using an inverter compressor.
21 citations
TL;DR: Compared to baseline, smokers in the maintenance phase had greater exposure to posters, provider advice and booklet, and better outcomes on seven of eight smoking cessation measures, including quitting, which were larger for clinics with prior experience implementing It's Time.
Abstract: Objectives.As phase 3 of a study to evaluate a smoking cessation program in public health practice, the authors assess the maintenance and impact of the It's Time smoking cessation program in seven public maternal and child health clinics in Chicago.Methods.The authors interviewed 404 clinic patients in the study's baseline phase (prior to introduction of the It's Time intervention program), and 610 in the program maintenance phase (in the year after experimental evaluation had ended) to assess exposure to smoking cessation interventions offered at the clinic, and smoking cessation outcomes (quit, actions toward quitting, scores on action, motivation, readiness, and confidence scales). The authors controlled for clustering of smokers within clinics, smokers' characteristics prior to clinic visit, and type of clinic service. They compared outcomes by study group (control or intervention) to which each clinic had been assigned in the earlier experimental phase.Results.Compared to baseline, smokers in the ma...
19 citations
Patent•
12 Jan 2001
TL;DR: In this paper, a refrigeration system utilizing a vortex generator and a diffuser to reduce the pressure differential between the head pressure and suction pressure across a compressor is described. But this system is not suitable for outdoor applications.
Abstract: A refrigeration system utilizing a vortex generator and a diffuser to reduce the pressure differential between the head pressure and suction pressure across a compressor
16 citations
Patent•
08 Nov 2001
TL;DR: An implantable intravascular device for diverting blood flow from the aorta into at least one renal artery of a living being to effect a reduction in the being's blood pressure is described in this paper.
Abstract: An implantable intravascular device for diverting blood flow from the aorta into at least one renal artery of a living being to effect a reduction in the being's blood pressure. The device comprises an anchoring means and a blood flow diverting means located on the anchoring means. The blood flow diverting element is arranged for movement between a stowed position and an extended position to effect the controlled diversion of blood into the at least one renal artery. A method of lowering blood pressure of a living being, the method comprising the steps of introducing a device into the aorta of a living being adjacent at least one renal artery whereupon the device increases the flow of blood to the at least one renal artery.
15 citations
Patent•
23 Aug 2001
TL;DR: In this article, a drying structure and process has a wet or damp mass to be dried in a container, and hot dry gas is fed into the container to flow over and/or through the mass, and the vapor-containing gas which is produced by contact with the mass is discharged from the container, to the input of a vortex tube.
Abstract: A drying structure and process has a wet or damp mass to be dried in a container. Hot dry gas is fed into the container to flow over and/or through the mass to be dried, and the vapor-containing gas which is produced by contact with the mass is discharged from the container to the input of a vortex tube. The vortex tube separates the humid vapor into a liquid which may be discharged, and a dried gas which is recirculated back to the container for further drying of the mass.
15 citations
Patent•
21 Feb 2001
TL;DR: In this article, an apparatus and method for determining the viscosity of a fluid over plural shear rates caused by a decreasing pressure differential by monitoring the changing weight of the fluid over time was presented.
Abstract: An apparatus and method for determining the viscosity of a fluid over plural shear rates caused by a decreasing pressure differential by monitoring the changing weight of the fluid over time. The apparatus and method utilize a riser, a capillary tube, a collector and a mass detector, such as a precision balance or a load cell, for monitoring the changing weight of a sample of fluid that flows through these components under the influence of the decreasing pressure differential. In addition, apparatus and methods for determining fluid viscosity online and fluid mixture homogeneity online are also described.
5 citations
Patent•
28 Aug 2001
TL;DR: A method for obtaining the viscosity of the circulating blood of a living being using an adulterated blood sample and a correlation factor obtained from a circulating blood viscometer is described in this paper.
Abstract: A method for obtaining the viscosity of the circulating blood of a living being using an adulterated blood sample and a correlation factor obtained from a circulating blood viscometer.
Patent•
21 Dec 2001
TL;DR: In this article, an apparatus and method for measuring the viscosity of Newtonian/non-Newtonian fluids over a range of shear rates, especially low shear rate, by monitoring two rising columns of fluid that pass through respective capillaries having different lengths is presented.
Abstract: An apparatus and method for measuring the viscosity of Newtonian/non-Newtonian fluids over a range of shear rates, especially low shear rates, by monitoring two rising columns of fluid that pass through respective capillaries having different lengths. Furthermore, a specialized column monitor is provided that uses multiple interrogation sources (e.g., lasers) and a single detector (e.g., a charge-coupled device array) to continuously monitor both columns of fluid substantially simultaneously. In particular, the system includes a Y-connector to form two flow paths and wherein each flow path includes a tube that includes a riser tube, a capillary tube of predetermined dimensions and a valve in each for controlling the fluid flow in each path. The specialized column monitor monitors fluid column movement in each of the riser tubes and an associated microprocessor analyzes these movements, along with the predetermined dimensions of the capillary tubes and riser tubes to determine the fluid viscosity.
Patent•
30 Jul 2001
TL;DR: In this paper, various apparatus and methods for determining and utilizing the viscosity of the circulating blood of a living being over a range of shear rates for diagnostics and treatment are presented.
Abstract: Various apparatus and methods for determining and utilizing the viscosity of the circulating blood of a living being over a range of shear rates for diagnostics and treatment such as detecting/reducing blood viscosity, work of the heart, contractility of the heart, for detecting/reducing the surface tension of the blood, for detecting plasma viscosity, for explaining/countering endothelial cell dysfunction, for providing high and low blodd vessel wall shear stress data, red blood cell deformability data, lubricity of blood, and for treating different ailments such as peripheral arterial disease.
Patent•
21 Sep 2001
TL;DR: In this paper, a method for increasing the efficiency of a vapor compression freezing cycle and a high efficiency freezing system by making use of one or more of vortex tubes was proposed, which can be further improved by providing the vortex tube across the evaporator.
Abstract: PROBLEM TO BE SOLVED: To provide a method for increasing the efficiency of a vapor compression freezing cycle and a high efficiency freezing system by making use of one or more of vortex tubes. SOLUTION: In a vapor compression freezing system, a vortex tube converts a refrigerant in a saturated vapor state to a refrigerant partly in a liquid state. Efficiency of the freezing system can be increased by providing the vortex tube on a front end of an evaporator. The efficiency of the freezing system can be further increased by providing the vortex tube at a position separated by about 1/4 of an entire condenser from an inlet of the condenser. Further, performance of the freezing system can be further improved by providing the vortex tube across the evaporator.
Patent•
09 Aug 2001
TL;DR: The authors concerne un rheometre a balayage, which concers a mesure de proprietes rheologiques de fluides electrorheologique (ER) and magnetorheologiae (MR) a l'aide d'un modele viscoplastique non lineaire, fonde sur la variation de hauteur du fluide par rapport au temps.
Abstract: La presente invention concerne un rheometre a balayage destine a la mesure de proprietes rheologiques de fluides electrorheologiques (ER) et magnetorheologiques (MR) a l'aide d'un modele viscoplastique non lineaire, fonde sur la variation de hauteur du fluide par rapport au temps. Ce rheometre comprend de facon fondamentale une source de fluide statique (par exemple un reservoir suspendu) ou dynamique, un canal ou une fente dont les cotes forment des electrodes qui sont en contact avec le fluide ER d'ecoulement, ou un tube capillaire expose a un champ magnetique statique/alternatif destine aux fluides MR d'ecoulement, un tube de transfert, soit une soit deux colonnes de montee, et un detecteur de niveau de colonne destine a surveiller la colonne de fluide lorsque celui-ci se deplace dans une des colonnes de montee. Ce detecteur de niveau de colonne est couple a un processeur qui analyse, entre autres choses, la hauteur de colonne en fonction de donnees de temps de facon a determiner la viscosite et l'effort de deformation permanente. Ce rheometre surmonte un des principaux inconvenients du rheometre traditionnel: l'incapacite de produire l'effort de deformation permanente du fluide ER ou MR dans la plage de vitesse de cisaillement du zero absolu. Les resultats obtenus avec ce rheometre sont compares avec ceux obtenus a partir d'un rheometre disponible sur le marche qui remporte un excellent accueil.