Heat transfer system

A method of moving heat into or out of a flowing fluid, comprising:

• pumping the flowing fluid through a heat transfer device,
• wherein the heat transfer device comprises a chamber for through flow of the flowing fluid,
• wherein a chamber wall in contact with the flowing fluid is an interface through which heat energy is transferred to or from the flowing fluid,
• wherein the chamber contains an array of spaced obstructions compelling the streamlines of the flowing fluid to repeatedly change direction in order to flow through gaps between the obstructions,
• wherein the flowing fluid contains a solute which enables the flowing fluid to display elastic turbulence,
• wherein a flow rate of the flowing fluid in the chamber is such that the flowing fluid is in a state of elastic turbulence,
• wherein the viscosity of the flowing fluid, the flow rate of the flowing fluid within the chamber, and a width of the gaps between obstructions give a Reynolds number (Re) for the flowing fluid which is in a range from 1 to 1000, and
• wherein the flowing fluid is an emulsion with a continuous phase which is a solution of the solute which enables the flowing fluid to display elastic turbulence and a suspended disperse phase which changes between solid and liquid at temperatures where the continuous phase is liquid.