Find a formula. Solve any missing value.

Mechanical Engineering

Number of Transfer Units (NTU)

Mechanical Engineering

\[NTU = \frac{UA}{c_{}}\]

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Nusselt Number (Nu)

Mechanical Engineering

\[St = \frac{\Nu}{Re \cdot P_{r}}\]

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Nusselt Number for Laminar flow-Bottom surface Heated

Mechanical Engineering

\[\Nu = 0.27 \cdot {\left(Gr \cdot Pr\right)}^{0.25}\]

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Nusselt Number for Laminar flow-Up surface Heated

Mechanical Engineering

\[\Nu = 0.54 \cdot {\left(Gr \cdot Pr\right)}^{0.25}\]

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Nusselt Number for turbulent-Bottom surface Heated

Mechanical Engineering

\[\Nu = 0.107 \cdot {\left(Gr \cdot Pr\right)}^{0.33}\]

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Nusselt Number for Turbulent-Up surface Heated

Mechanical Engineering

\[\Nu = 0.14 \cdot {\left(Gr \cdot Pr\right)}^{0.33}\]

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Nusselt Number for Vertical plates and Large Cylinder

Mechanical Engineering

\[\Nu = 0.59 \cdot {GrPr}^{0.25}\]

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Optimum time for Maximum Profit rate

Mechanical Engineering

\[T_{m} = \frac{1}{f \cdot N}\]

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Peak to Valley Height

Mechanical Engineering

\[H_Max = ( ( f ^ ( 2 ) ) / ( 8 \cdot R ) )\]

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Per Order time in with Instantaneous Replenishment

Mechanical Engineering

\[Time_{Taken\_Per\_Order} = \frac{Q_{star}}{D}\]

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PERT Expected time

Mechanical Engineering

\[t_{e} = \frac{t_{0} + 4 \cdot t_{m} + t_{p}}{6}\]

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Pitch diameter for helical gear

Mechanical Engineering

\[d = \frac{z \cdot m_{n}}{cos}\]

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Poiseuille’s Equation

Mechanical Engineering

\[V = \frac{\pi \cdot P \cdot {r}^{4}}{8 \cdot \eta \cdot l}\]

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Poisson Ratio

Mechanical Engineering

\[Poisson_{Ratio} = \frac{Lateral_{Strain}}{Linear_{Strain}}\]

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Polar moment of inertia of Circular Shaft

Mechanical Engineering

\[J = ( ( \pi \cdot d ^ ( 4 ) ) / ( 32 ) )\]

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Power transmitted by clutch

Mechanical Engineering

\[P = \frac{2 \cdot \pi \cdot N \cdot T}{60}\]

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Prandtl Number (Pr)

Mechanical Engineering

\[Pr = \frac{Momentum_{diffusivity\_through\_the\_fluid}}{Thermal_{diffusivity\_through\_the\_fluid}}\]

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Probability customers exceed a given number

Mechanical Engineering

\[probability_{customers\_exceed\_a\_given\_number} = \frac{\lambda}{\mu} \cdot k\]

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Probability that the queue is non-empty

Mechanical Engineering

\[probability_{that\_the\_queue\_is\_non\_empty} = {\frac{\lambda}{\mu}}^{2}\]

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Punching and Blanking Punch load

Mechanical Engineering

\[Punch \cdot load = \pi \cdot D \cdot t \cdot K_{prime} \cdot \frac{Penetration}{Shear_{on\_punch}}\]

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Quantity Q2 in Purchase Model with Shortage

Mechanical Engineering

\[Q_2 = Q - Q_1\]

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Ratio of Hoop Strain to Longitudinal Strain

Mechanical Engineering

\[varepsilon_{v} = \frac{p \cdot d}{4 \cdot t \cdot E} \cdot \left(5 - 4 \cdot \mu\right)\]

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Reaction force in cone clutch

Mechanical Engineering

\[R_{n} = \frac{w}{2 \cdot \pi \cdot R_{m} \cdot b \cdot \sin\left(\alpha\right)}\]

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Reflectivity

Mechanical Engineering

\[Reflectivity \cdot \rho = \frac{Energy_{reflected} \cdot Q_{r}}{Total_{incident\_radiation} \cdot Q}\]

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