I. A. Popov

Industrial applications of heat transfer enhancement: The modern state of the problem (a Review)

Methods used for enhancing heat transfer in power installations and industrial thermal engineering apparatuses are reviewed. Classification of these methods is given, and the corresponding types of intensifiers are considered.

Heat transfer enhancement and critical heat fluxes in boiling of microfinned surfaces

A brief review is presented of experimental investigations of heat transfer enhancement during boiling on surfaces with nano- or microstructure. Distilled water boiling on microfinned surfaces made by deforming cutting was investigated. It was found that, for distilled water boiling on these surfaces with 3D microfinning (having an interfin gap of u = 120–180 μm, a microfin height of h = 340–570 μm, and a microfin pitch of w = 240–400 μm), heat transfer increased by a maximum factor of 4 to 5 as compared with that on smooth surfaces. Critical heat fluxes increase by a factor of up to 6 as compared with boiling on smooth surfaces.

Cooling systems for electronic devices based on the ribbed heat pipe

We present the results of an experimental study of cooling systems on the basis of the finned heat pipes by applying a system of spherical recesses/projections at the ribs. The possibility of reducing the total thermal resistance of the cooling systems by 20–40% is presented in the entire range of studied thermal loads. Recommendations for rational application of heat transfer intensifier are given.

The scientific basis of calculations of highly efficient compact heat-transfer apparatuses with judicious heat-transfer intensifiers

Results of classification of the existing data on hydrodynamics and heat transfer under forced convection in channels with spherical holes (SHs) are presented. The energy efficiency of the use of SHs under laminar and turbulent flow of a coolant is shown. The effects of regime and design parameters on heat transfer in such channels are studied. A flow-regime chart is developed.

Boiling heat transfer of different liquids on microstructured surfaces

The results of an experimental study of heat transfer on microstructured surfaces are presented. The surfaces studied have been obtained by deforming cutting and have different structural shapes and sizes. Recommendations are given for the use of the surfaces studied in boiling of different liquids.

Efficiency of Surface Heat Transfer Intensifiers for Laminar and Turbulent Flows in Heat Exchanger Channels

The present work presents the comparison of efficiency of surface-type intensifiers in a wide range of geometric parameters and in the range of Reynolds numbers corresponding to rated laminar and turbulent flow regimes in a channel on the basis of a single general criterion. It is also aimed to clarify objective thermal and hydraulic properties of intensifiers, to present a table of intensifier optimal parameters for the further theory and practice development, to formulate practical recommendations for selecting intensifier types and parameters in the design of promising energy-saving heat transfer equipment. The comparison of intensifiers efficiency was carried out under identical conditions for constricted and unobstructed channels containing intensifiers of various shapes. It is shown that intensifiers in the form of transverse annular ridges and systems of spherical holes show high thermal and hydraulic efficiency at specific flow operating parameters and design parameters of both, a channel and intensifier. The acquired results and recommendations on optimal parameters of surface-type intensifiers make it possible to calculate and design heat exchangers with intensifier optimal configurations and sizes. To confirm the obtained fundamental knowledge in the field of surface heat transfer augmentation based on a system of spherical holes/ridges several heat exchanger prototypes were developed.Copyright