A METHOD FOR CONTROLLING THE OVERALL HEAT TRANSFER COEFFICIENT OF A HEAT EXCHANGE FLUID

摘要

The method is characterized (A) by incorporating in the heat exchange fluid a functionally effective amount of a viscoelastic surfactant composition which comprises (1) a surfactant compound having a hydrophobic moiety chemically bonded to an ionic, hydrophilic moiety and (2) an electrolyte having a moiety that is capable of associating with the surfactant ion to form a viscoelastic surfactant and (B) by providing a flow rate and a temperature of the heat exchange fluid such that the heat transfer fluid has the desired overall heat transfer coefficient. Using this method, it is possible to provide a high heat transfer coefficient in a high temperature heat exchange region, while providing drag reduction and a low heat transfer coefficient in the distribution lines.