Ap surface area of copper plate (m2)

AR aspect ratio D hydraulic diameter (m) Dp dimple print diameter (m) e rib height (m)

h heat transfer coefficient (W/m2 K)

k thermal conductivity of coolant (W/mK)

L length of duct (m)

Nu regionally averaged Nusselt number, hD /k

Nuo Nusselt number in fully-developed turbulent non-rotating smooth tube flow

Pr Prandtl number

Q heat transfer (W)

qnet" net heat flux at wall based on projected area (W/m2)

R mean rotating radius (m)

Re Reynolds number, pVD /m

Ro rotation number, WD/V

Tbi inlet coolant bulk temperature (K)

Tbx local coolant bulk temperature (K)

Tw wall temperature (K)

V bulk velocity in streamwise direction (m/s)

b angle of channel orientation

8 dimple depth

W rotational speed (rad/s)

p density of coolant (kg/m3)

Ap /p coolant-to-wall density ratio, (Tw -Tbi)/Tw

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