Heat Transfer in Rectangular Channels

It is given as the duct length required for the Nusselt number to fall within a 5% interval of the fully developed value. Again, a dimensionless quanhty 

---

Flow Boiling Heat Transfer in Rectangular Channel... 

In this work, microscale evaporation heat transfer and capillary phenomena for ultra thin liquid film area are presented. The interface shapes of curved liquid film in rectangular minichannel and in vicinity of liquid-vapor-solid contact line are determined by a numerical solution of simplified models as derived from Navier-Stokes equations. The local heat transfer is analyzed in term of conduction through liquid layer. The data of numerical calculation of local heat transfer in rectangular channel and for rivulet evaporation are presented. The experimental techniques are described which were used to measure the local heat transfer coefficients in rectangular minichannel and thermal contact angle for rivulet evaporation. A satisfactory agreement between the theory and experiments is obtained. 

Heat transfer in microsystems under pressure-driven flow conditions is considered here. Figure 9.8 shows two large infinite parallel plates, separated by distance, H, with uniform surface heat flux q. This configuration can be used to model flow and heat transfer in rectangular channels with large aspect ratio. Velocity and temperature are assumed to be fully developed. Inlet and outlet pressures are P,- and P , respectively. 

---