Depleting energy resources have become the driving force for their conservation. Increasing the system efficiencies is one method by which sustainability of energy may be ensured, for which miniaturization has successfully provided solutions. Miniature heat exchangers, owing to their high thermal performance, have the potential to provide energy efficient systems. In addition, their characteristics of compactness, small size and lesser weight have attracted widespread applications. Various works on micro- and minichannel heat exchangers as heat sinks and heat exchangers have been reviewed in this paper. Currently employed fabrication techniques and different applications have been summarized. An overview of the single-phase thermo-hydraulic studies in micro- and minichannel heat sinks has been presented. Literatures related co-current, counter-current and cross-current micro- and minichannel heat exchangers have been discussed. Finally, the persisting lacunae of this technology drawn from the review have been pointed out.

Review of micro- and mini-channel heat sinks and heat exchangers for single phase fluids

Microengineered reactors are a new type of reactor. Their novelty dictates a new approach in design, which requires familiarization with the various manufacturing techniques and materials, and with differences in fluid behaviour and dominant phenomena in the microscale. New approaches for energy management, catalyst incorporation and integration of functions and unit operations can be employed. Microengineered reactors have some unique characteristics which create the potential for high performance chemicals and information processing. These include efficient mass and heat transfer and precise control of the hydrodynamic environment. They can provide significant advantages in information generation in high throughput experimentation and process development, and from difficult to obtain operating regimes. In terms of chemicals manufacture, they allow distributed, mobile and intensified processing. This technology, still in its infancy has the potential to change the chemical engineering landscape.

Technology and Applications of Microengineered Reactors

A review of the Residence Time Distribution (RTD) applications in solid unit operations

Single-phase fluid flow distribution and heat transfer in microstructured reactors

Concepts and realization of microstructure heat exchangers for enhanced heat transfer

The aim of this work is to determine the order of magnitude of the optimal heat conductivity by simulation. Furthermore, the question of whether and, if so, how operational and geometrical parameters influence the optimal heat conductivity is addressed. Finally, an assessment is made of the need for similar investigations, i.e. taking into account axial heat conductivity processes within the wall materail, for the design of conventional heat exchangers

Numerical Investigations of Optimal Heat Conductivity in Micro Heat Exchangers

Development of a fast sensor for the measurement of the residence time distribution of gas flow through microstructured reactors

Proposition d'une modelisation du transfert de chaleur dans les micro-echangeurs de chaleur

Numerische Untersuchungen zur optimalen Wärmeleitfähigkeit in Mikrowärmeübertragerstrukturen

In a system for measuring the number and physiological activity of cells or organisms, esp. microorganisms, an electrical measuring signals is produced directly by redox reactions of the energy exchange of the cells or organisms.

Otto-Ulrich Langer

Papers

Numerical Investigations of Optimal Heat Conductivity in Micro Heat Exchangers

Development of a fast sensor for the measurement of the residence time distribution of gas flow through microstructured reactors

Numerische Untersuchungen zur optimalen Wärmeleitfähigkeit in Mikrowärmeübertragerstrukturen

Measurement of number and physiological activity of cells or organisms

DECHEMA‐Weiterbildungskurs „Mikroverfahrenstechnik”︁