A NEW FLOW MIXING CALORIMETER FOR OPERATION ON GASES AT HIGH-TEMPERATURES AND PRESSURES

A new flow mixing calorimeter for operation at temperatures up to 700 K and pressures up to 30 MPa is described. The calorimeter is designed for use with dense gases or supercritical fluids. The design features a reverse flow labyrinth containing stainless steel gauze discs to pr omote turbulence and ensure efficient mixing. The reverse flow design confines temperature gradients to the centre of the calorimeter, and e nsures that heat leaks are small. Values of the excess molar enthalpy H(m)E of argon plus steam obtained using the calorimeter were found to be independent of flow rate over a tenfold range.