What is Reynolds: Definition and 124 Discussions

The Reynolds and Reynolds Company is a private corporation based in Dayton, Ohio. Its primary business is providing business forms, management software and professional services to car dealerships. Its software is used to manage sales logistics at dealerships. It also produces forms used in medicine and insurance.
Reynolds and Reynolds was founded in 1866 as a printer of standardized business forms. It began developing and marketing digital products in the 1960s. This was followed by a major downsizing of the printing division and subsequent advancements in its software products. By the 1980s, Reynolds and Reynolds had won contracts with all of the Big Three automotive manufacturers, as well as some insurance businesses. The company went public in 1961, but was re-formed as a private company in 2006, when it was merged with Universal Computer Systems, resulting in a culture clash between the two companies.

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  1. D

    Change in flow / velocity direction and the Reynolds number

    Hi, I am interested in the relationship between changes in flow direction (and changes in flow velocity) and the Reynolds number. Reynolds number = (fluid density) * (velocity) * (tube length) / (viscosity) Reynolds number = (flow rate) * (tube length) / [(viscosity) * (cross-sectional...
  2. K

    How to Calculate Reynolds Number for Pulsating Swirl Flow?

    Does anyone here know how to calculate the reynolds number for a pulsating swirl flow? I've been trying to find the right expression for ages, I can't locate it. I'm sure it will be a integral equations based upon the frequency of swirl (i.e. 1Hz, 5Hz or 10Hz etc) Thanks
  3. Saladsamurai

    Reynolds Transport Theorem Notational Issue

    Perhaps someone can clear up some confusion for me. EQs (1) and (2) are synonymous, but use different notations for the derivative. In my textbook, the RTT is written in the following form: Given some fluid property 'B,' let \beta be the intensive property \beta = d\, B/d\, m. Then the rate...
  4. J

    Osbourne Reynolds: The Sub-mechanics of the Universe

    Osbourne Reynolds: "The Sub-mechanics of the Universe" While reading a very interesting article/lecture called http://jilawww.colorado.edu/perkinsgroup/Purcell_life_at_low_reynolds_number.pdf, there was a reference to a publication by Osbourne Reynolds called The Sub-mechanics of the Universe...
  5. E

    Can You Calculate Reynolds Number with Limited Data on a Scaled Missile Model?

    hi i have to find out the reynolds number for a missile launched from a sub. i only have the temperature of the water, the dimensions of the missile and the velovity of a model of the of the actual missile at a scale of 1:10 i havn't given any quantities because i don't want a...
  6. J

    Wind tunnel tests and Reynolds Number

    I have a question about Reynolds Number and wind tunnel tests. Last semester a few students at my university were conducting wind tunnel tests on a small model of a truck, they were trying to find ways to reduce the drag in order to save fuel. I would guess they were testing at a Reynolds Number...
  7. S

    Fluid mechanics Reynolds number equation query

    1.I have been asked to: Calculate the density of a fluid if a ctitical velocity of 2m/s at Re=2000 in a pipe of bore 90mm at a dynamic viscosity oc 0.09cP I have calcualted the variables to SI units and found \rho=? Um (V) =2m/s D=0.09m \mu=0.09X10^-3 I am rearranging this...
  8. B

    Reynolds Number of a circular plate perpendicular to external flow

    Hello, I am trying to obtain how to find the Reynolds Number of a circular plate perpendicular to external flow. Thanks
  9. C

    Can Reynolds Number be Calculated for a Random Point?

    Hey guys, I'm looking for a little help understanding Reynold's Number. I know that its the ratio of the inertial forces versus the viscous forces. With that being said, everywhere I look, the Reynold's Number is calculated for flow in a pipe or duct or across some sort of surface. Why can't...
  10. P

    3 Law on Reynolds momentum transport equation

    I want to know how Reynolds Equation of Momentum is accord with the 3rd law of Newton, the law of action-reaction forces. For an ideal fluid, we have that [tex] \frac {\partial m \vec {v}} {\partial t} = \vec v [ \frac {\partial {\rho }} {\partial t} + \nabla [ \rho \vec v ] + \rho [\frac...
  11. C

    How Do You Calculate Reynolds Number for Flow Exiting a Rectangular Duct?

    Homework Statement Hi everyone, This problem concerns calculating Reynold's Number of flow after exiting a duct. The duct that the flow exits is rectangular. The flow is measured directly underneath the center of the duct at a distance of 10 cm below the exit (Y-axis). Flow is measured...
  12. T

    Reynolds number - Characteristic dimension

    Are there any reference tables for what to use as the characteristic dimension of various shapes when calculating the Reynolds number? I am very interested in ballistics, and have done research and calculations for various ways of estimating the drag coefficient of various bullet shapes. I...
  13. M

    Designing Airfoils: Choard Sizing & Printing - Low Reynolds #50000

    Hi I need a software for designing airfoil that alows changing the choard size and printing. If you know any please tell me. Btw do you know any refrence for low Reynolds number (about 50000)? I want to choose NACA7610 for my glider but I don't know exactly how it behaves at low Reynolds...
  14. C

    How Does Changing Mass Flow Rate or Diameter Affect Reynolds Number?

    The question gives this .. The Reynolds number, Re, is a dimensionless group which characterizes the intensity of a flow. For large Re, a flow is turbulent; for small Re , it is laminar. For pipe flow, Re=u(density)D/mu, where D is pipe diameter and mu is dynamic viscosity. It asks ...
  15. H

    Why Does Reynolds Analogy Overestimate Heat Transfer?

    Hi all. Why Reynolds Analogy and other empirical relations always overesimate heat transfer? I have done an experiment on turbulent pipe flow (smooth pipe) and I used Reynold Analogy (both the simple (Pr=1) and the modified one) and the Dittus-Boetler correlation equation to do the...
  16. G

    Reynolds number may have a similar effect to the Knudsen number

    Reynolds number prominence to slip/stick the gases on the walls Dears A major question has arisen during the comparison of experimental evidence and numerical results. The problem is also recognized by some of the researchers but it’s not fully exhausted yet [1,2]. I know from the slip flow...
  17. M

    Reynolds Transport Theorem and Conservation Laws.

    The Reynolds Transport theorem (RTT) is usually applied to derive the conservation of mass, momentum and energy in a fluid. But when I try to apply the RTT to other physical quantities, I get weird results. Can anyone see where I'm going wrong? As a simple example, take the physical...
  18. P

    The reynolds number equation, .

    I understand most of the equation. [tex] Re=\rho *D *V over a symbol I don't recognize I don't know what the symbol is the denominator, and I can't find its name so I don't know what it means. I just need one definition, thanks.
  19. H

    What is the Effect of Influx and Efflux in Reynolds Transport Theorem?

    Hi all! I am confused about the theorem quite much. The theorem says that the time rate of change of a property of a system is equal to the local rate of such property in a control volume plus the efflux of the respective intensive property across its control surface. I am wondering the...
  20. N

    Relating the Reynolds number to the Drag Coeffient

    How does one relate the Reynolds number to the Drag Coeffient? It seems the drag coefficient for different velocities must be determined experimentally per set. I know the Reynolds number is a method to determine laminar or turbulent flow, but can it be used to determine the drag coefficient?
  21. Cyrus

    How Does the Reynolds Transport Theorem Apply to Electromagnetics?

    I have come across the Reynolds Transport Theorm in my study of Fluid Dynamics, and it's a very powerful tool. \frac {DB_{sys}}{Dt} = \frac{ \delta}{\delta t} \int_{cv} \rho b dV + \int_{cs} \rho b \vec {V} \cdot \hat {n} dA Where B is any extensive property of the system, and b is any...
  22. H

    Friction factor on very very low reynolds number

    hai all, I'm now doing a research about castor oil. I've a got a few a confusing problems.. 1. to flow castor oil in a 12 mm acrylic pipe i use a reservoir 1 metres from the outlet. Because castor oil is very thick (dyn visc. = 0.5 Pa-m), the velocity of the flow is very low just about 0.02...
  23. Clausius2

    Reynolds 10^5 & Hazen-Williams Friction Model: Is There a Problem?

    Is there some reason for Hazen-Williams friction model to failure in a hydraulic circuit?. I have simulated an hydraulic system in a commercial code, and this model is the unique which gives stupid results like infinite volumetric rates. The Reynolds is about 10^5.
  24. T

    Higher Reynolds number?

    Hi all! In a pipe flow, when the flow rate of water is increasing, reaching a critical flow rate, the flow will switch from laminar to transition flow, right? And continue the increase of flow rate will further change it to turbulent flow. The Reynolds number for these 2 transitions are...
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