High pressure flow-rate switch

Flow-rate switch adjusts easily over a wide switching range and operates uniformly over many cycles. It adapts easily to control of various fluids and has the possibility of introducing multi-point switching. Novel design features include the tapered spool, balanced porting, capillary-bypass lubrication, and capillary-restriction damping

Variable Powder Flow Rate Control in Laser Metal Deposition Processes

This paper proposes a novel technique, called Variable Powder Flow Rate Control (VPFRC), for the regulation of powder flow rate in laser metal deposition processes. The idea of VPFRC is to adjust the powder flow rate to maintain a uniform powder deposition per unit length even when disturbances occur (e.g., the motion system accelerates and decelerates). Dynamic models of the powder delivery system motor and the powder transport system (i.e., five–meter pipe, powder dispenser, and cladding head) are first constructed. A general tracking controller is then designed to track variable powder flow rate references. Since the powder flow rate at the nozzle exit cannot be directly measured, it is estimated using the powder transport system model. The input to this model is the DC motor rotation speed, which is estimated on–line using a Kalman filter. Experiments are conducted to examine the performance of the proposed control methodology. The experimental results demonstrate that VPFRC is successful in maintaining a uniform track morphology, even when the motion control system accelerates and decelerates.Mechanical Engineerin

Prototype Boiling Ketupat Type of Batch Study of Heat Transfer Coefficient Into Condensor

So far for producing ketupat done using boiling system open by using a regular steamer so much heat loss occurs due to his high consumption of fuel, to reduce the fuel consumption of the writers tried to make a prototype of a batch type boiling ketupat equipped with condenser.Purpose to condensation steam in boiling water so that it does not require the addition of water.Energy consumption in a way traditional ketupat boiling takes time for 4 hours for all processes with the same time as that of 285000 kJ/kg while using a prototype wave energy consumption i.e. batch type of 37341 kJ/kg for cooling fluid flow rate 5 lt/min, 37802 kJ/kg for cooling fluid flow rate 10 lt/min and 46100 Lt/min for the coolant flow rate 15 lt/min. Influence of flow rate of cooling fluid on the heat transfer coefficient is proportional, the greater the flow rate of cooling fluid then the greater the coefficient of heat transfer rates. This is due to the heat lost when still on the way to the condenser and heat lost due to contact between the condenser with outside air

Methods For Growing A Non-phase Separated Group-iii Nitride Semiconductor Alloy

Systems and methods for MBE growing of group-III Nitride alloys, comprising establishing an average reaction temperature range from about 250 C to about 850 C; introducing a nitrogen flux at a nitrogen flow rate; introducing a first metal flux at a first metal flow rate; and periodically stopping and restarting the first metal flux according to a first flow duty cycle. According to another embodiment, the system comprises a nitrogen source that provides nitrogen at a nitrogen flow rate, and, a first metal source comprising a first metal effusion cell that provides a first metal at a first metal flow rate, and a first metal shutter that periodically opens and closes according to a first flow duty cycle to abate and recommence the flow of the first metal from the first metal source. Produced alloys include AlN, InN, GaN, InGaN, and AlInGaN.Georgia Tech Research Corporatio