INFINITY TURBINE LLC We specialize in designs, plans, licensing, consulting, design services, and surplus spare parts. We no longer manufacture turbines or CO2 systems. More Info...
TEL: +1-608-238-6001 (Chicago Time Zone ) USA
Email: greg@infinityturbine.com
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The Shift from AC to DC Power Production for AI Data Centers AI data centers are pushing electrical infrastructure to its limits. The traditional AC power chain is no longer optimal for GPU-driven workloads. A DC-native architecture using Infinity Turbine’s Cluster Mesh system offers a path to higher efficiency, lower costs, and scalable modular power—potentially saving tens of millions per year at hyperscale... More Info
SMR and Cluster Mesh Supercritical CO2 Power System for Data Centers and AI Pairing Cluster Mesh Supercritical CO2 Power System with Small Modular Reactors enables hyperscalers to convert high-grade nuclear heat into ultra-efficient, dispatchable power with a compact, modular footprint tailored for AI-scale demand. More Info
ORC and Products Index Infinity Turbine ORC Index... More Info
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Tesla Disc Pump Performance Analysis for Five Horsepower and Ten Horsepower Water Pumping Applications This article evaluates the real world hydraulic performance of Tesla disc pumps driven by five horsepower and ten horsepower motors at thirty six hundred RPM, comparing expected water flow rates and head pressures while explaining the physical limits imposed by disc diameter, tip speed, and motor powerTesla Disc Pump FundamentalsA Tesla disc pump transfers energy to fluid through viscous shear between closely spaced rotating discs. Unlike conventional centrifugal impellers, the fluid is dragged by boundary layer adhesion rather than by blade impact. This makes the Tesla disc pump highly tolerant of dirty water, suspended solids, fibrous material, and entrained gases.However, this same operating principle results in lower efficiency than a well designed centrifugal pump. For water service, overall efficiencies typically fall between twenty percent and forty five percent depending on disc spacing, surface finish, stack width, housing geometry, and clearances.Because of this, Tesla disc pump performance is best evaluated using three governing limitsTip speed determines the theoretical head potentialMotor horsepower limits the achievable combination of flow and headInlet diameter controls suction velocity and cavitation margin but not total power capabilityCase OneFive horsepower motor at thirty six hundred RPMThree inch inletSix inch disc diameterTip Speed and Head PotentialWith a six inch disc spinning at thirty six hundred RPM, the disc edge travels about ninety four feet per second. This corresponds to a theoretical head scale of roughly two hundred seventy six feet of water.A Tesla disc pump typically achieves only a fraction of this due to viscous slip. A realistic operating fraction ranges from five percent to twenty five percent of the theoretical scale. This produces a practical head range of approximately forty to seventy feet of water, equivalent to seventeen to thirty pounds per square inch.Power Limited FlowFive horsepower equals three point seven three kilowatts of motor input. With realistic efficiency between thirty and forty percent, usable hydraulic power ranges from one point one to one point five kilowatts.At forty feet of head, expected flow is approximately one hundred fifty to two hundred gallons per minute.At seventy feet of head, expected flow is approximately ninety to one hundred fifteen gallons per minute.Practical Operating RangeFor clean or dirty water, a properly designed six inch Tesla disc pump driven by five horsepower will realistically operate in the following rangeFlow between ninety and two hundred gallons per minuteHead between forty and seventy feetThe three inch inlet easily supports these flows with low suction velocity, so cavitation risk depends more on piping losses and NPSH available than on inlet size alone.Case TwoTen horsepower motor at thirty six hundred RPMSix inch inletTwelve inch disc diameterTip Speed and Head PotentialWith a twelve inch disc at the same speed, tip velocity doubles to approximately one hundred eighty eight feet per second. Because head scales with the square of speed, theoretical head potential increases by roughly four times.In practice, Tesla disc pumps again realize only a fraction of this potential. A realistic operating head range becomes approximately one hundred to two hundred feet of water, depending on flow selection and disc design.Power Limited FlowTen horsepower equals seven point four six kilowatts of motor input. With efficiency between thirty and forty five percent, usable hydraulic power ranges from about two point two to three point four kilowatts.At thirty feet of head, expected flow is approximately four hundred to six hundred gallons per minute.At sixty feet of head, expected flow is approximately two hundred to three hundred gallons per minute.At one hundred twenty feet of head, expected flow is approximately one hundred to one hundred fifty gallons per minute.Practical Operating RangeA twelve inch Tesla disc pump driven by ten horsepower can be tuned for either high flow transfer or moderate pressure serviceHigh flow modeFour hundred to six hundred gallons per minute at about thirty feet of headBalanced modeTwo hundred to three hundred gallons per minute at about sixty feet of headPressure oriented modeOne hundred to one hundred fifty gallons per minute at about one hundred twenty feet of headThe six inch inlet provides excellent suction margin even at very high flow rates.Direct ComparisonThe larger twelve inch disc pump does not simply double performance.Doubling disc diameter doubles tip speed, which increases theoretical head potential by about four times. But motor power only doubles from five horsepower to ten horsepower. This means the designer must trade between higher flow or higher head rather than achieving large increases in both simultaneously.In practical termsThe five horsepower unit is best suited for one hundred to two hundred gallon per minute dirty water transfer at moderate headThe ten horsepower unit is best suited for two hundred to six hundred gallon per minute transfer or for moderate pressure pumping at reduced flowHead Pressure in Practical UnitsForty feet of water equals approximately seventeen pounds per square inchSixty feet equals approximately twenty six pounds per square inchOne hundred twenty feet equals approximately fifty two pounds per square inchTwo hundred feet equals approximately eighty seven pounds per square inchTesla disc pumps can reach higher pressures in multistage or very tight clearance designs, but single stage units are generally most practical below one hundred fifty feet of head for water service.Application Advantages of Tesla Disc PumpsTesla disc pumps are especially valuable whenPumping abrasive or dirty waterHandling fibrous or stringy materialOperating with entrained gasRequiring clog resistant geometryAccepting lower efficiency in exchange for robustnessThey are less attractive where maximum efficiency and high pressure at low flow are required, which remain the strengths of conventional centrifugal or positive displacement pumps.ConclusionA five horsepower Tesla disc pump with six inch discs and a three inch inlet will realistically deliver approximately ninety to two hundred gallons per minute at forty to seventy feet of head.A ten horsepower Tesla disc pump with twelve inch discs and a six inch inlet can deliver approximately two hundred to six hundred gallons per minute depending on selected head, or provide moderate pressure service at reduced flow.The dominant limits are not inlet size or disc diameter alone, but the balance between disc tip speed, viscous coupling efficiency, and available motor horsepower.When properly designed, Tesla disc pumps provide a rugged and versatile solution for water and slurry pumping applications where reliability and solids tolerance are more important than peak hydraulic efficiency. |
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