Flow in conjugated natural circulation loops

Two natural circulation loops are considered thermally coupled through a heat exchanger common to both. Over the rest of the loops, the heat inflow per unit length is assumed known. A steady-state analysis is made in order to determine the fluid velocities and temperature distributions. Certain general results can be obtained for loops of arbitrary shapes. The special case of square geometries is also considered. The possibility of four different steady-state conditions is demonstrated and the variation of these solutions with respect to the system parameters is discussed