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Hello, I have searched the interwebs looking for this data and I cannot find it. I need Cd and Cl for a flat plate through an entire 360 degree rotation of AoA, including different sets of curves for different aspect ratios up to infinity. If anyone has this data it will be greatly...

Hello, I am trying to calculate the power loss associated with windage for flat disks about 6 feet in diameter. If I have disk speed, diameter and fluid properties; is there a generalized formula for calculating power loss? I have found a document that calculates this value for a cylinder...

Hello, I am a little bit confused. From what I understand, pressure shouldnt rise through a heat exchanger, temperature is what is controlled through it. I was told from an AC technician that the pressure rises through a heat exchanger, I thought that was not possible since the gas is...

I need a way to calculate what the pressure drop across a typical automotive turbocharger turbine section is. For example, dont assume exhaust gas at 1400F as the working fluid. Just assume analytically, P1, T1 entering the turbine and P2, T2 exiting (air) what would be a good rough estimate...

Hello, I am not an HVAC designer, but I have a project that involves freon as the working fluid and a typical AC expansion valve. If the freon enters the expansion valve at some pressure and temperature in liquid state, what is the 'typical' exit pressure and temperature that must be seen...

Hello, I was asked to compute oil flow requirements for journal bearings for a power turbine. There are three bearings, two journal and one thrust, all fluid film. Shaft diameter is 12" and speed is 3600 RPM. That puts the surface speed at about 188 ft/s. I went to the kingsbury website and...

Hello, I am looking to purchase a cheap borescope. I dont want to spend more than $250. I know that a good scope can cost thousands. I am not in the market for a professional grade scope, I just want something that can capture images and store them on a little micro SD card for data transfer...

Hello, I am a designing a piping system that branches off in a few locations. I am using a 1D flow system software. There are flow rate requirements for the different branches in this system. The overall system flow rate is given to me and the flow rate requirement of each branch. I first...

Hello, I currently use ANSYS thermal to predict metal temperatures of electrical components. Some of you probably already know the extent by which I went to calculate heat generation of these electrical components. I would like to be able to apply an electrical current and have ansys...

Hello, I am trying to understand what the limits are of pre-compressor methanol injection on turbocharged cars. From my understanding, erosion occurs when you have the wrong combination of compressor speed and droplet size. I have a turbocharger and I calculated the tip speed of the...

Hello, I am trying to calculate roughly the value for bolted copper busbar resistance. I have viewed this website http://www.copperinfo.co.uk/busbars/pub22-copper-for-busbars/sec7.htm#Joint But the information is less consistent than reality. I am seeing more like 5-7 micro-ohms...

Hello, I am trying to compute the skin effect ratio of a rectangular section that is 44mm tall and 25.4mm wide with a known length of 251.4mm. The AC current is defined as being 133 Hz at 1350 Amps through this conductor. I am using this formula from this website...

Hello, I am a mechanical engineer that is tasked to predict lug metal temperatures of power distribution equipment. I need some type of rough idea on the typical resistances seen at bolted lug connections: For example Aluminum to copper bolted connections Copper DLO cable to set screw lugs...

Hello all, Does anyone know of a way to scale a heat transfer coefficient with respect to fluid density? Although Reynolds is dependant on density, allow that to fall out. Say I have an HTC = 5, I now change the density of the fluid by 16%, what will be my new HTC assuming the Reynolds number...

Hello. I am faced with a real problem. I need to perform an analysis on electrical lug connections used in very large circuit breakers. The lug connections use about 1" thick solid copper bus and terminate to 4 large DLO 313kcmil cables. Each side of bus has two lugs, a total of 4 per end of...

Hello, QUESTION 1: I have to calculate convection coefficients (h's). I have a textbook here in front of me (Incropera/DeWitt/Bergman/Levine 6th edition fundamentals of heat and mass transfer). On page 451, equation 7.75 represents a relation between Nusselt number and other parameters...

Hello, I am trying to find a correlation for the heat of vaporization of water versus temperature. I found this on wikipedia, http://en.wikipedia.org/wiki/Enthalpy_of_vaporization but the graph on the right has no correlation displayed. The purple line is what im looking for. The...

Hello. Has anyone ever heard of Lucas in Reid, Prausnitz and Poling? I don't have the book, if someone does have this book; can you tell me exactly what this correlation or method is entails? Also, who has a a good explanation of the Chen correlation. I was googling it and did not find much...

Hello, I need to calculate friction factor for different reynolds numbers or relative roughness, does anyone have a moody chart that is in a spreadsheet that I may use as a look-up table? Better yet, the correlations for each trend? Thanks,

Hello, I have two questions, 1. When calculating the pressure drop due to an abrupt contraction, do I use the minor diameter or the major diameter with equation 3-14 of Cranes (page 3-4)? It calls for a diameter, and I don't know which to use. Same question pertains to an expansion. 2. I...