Porous media simplified simulation of single- and two-phase flow heat transfer in micro-channel heat exchangers

Synthesis of ethylene glycol-treated Graphene Nanoplatelets with one-pot, microwave-assisted functionalization for use as a high performance engine coolant

“…Enhancing the thermal efficiency for optimizing the size of radiators or heat exchangers for decreasing the vehicle weight was reported in [1][2][3]. Different approaches such as addition of fins, use of micro-channels and high speed fans have been utilized [4]. However, many of the conventional methods for increasing the cooling rate by the above-mentioned approaches have faced certain limitations [5].…”

Testing and simulation of ceramic micro heat exchangers

“…In addition heat transfer takes place outside the heat exchanger core, especially in the ceramic tubes. Applying TwoPorFlow to a compact metallic crossflow heat exchanger composed of 1700 microchannels with the size of 0.1 mm × 0.2 mm such deviations did not appear [9]. Due to the smaller size of the channels and a much larger heat transfer area density (10,000 m −1 ) the heat exchanger core dominates pressure loss and heat transfer compared to external effects of media supply.…”

“…Steady states are calculated by a transient approach. It has been shown that the code gives reliable results in the application to metallic microchannel compact heat exchangers of counterflow and crossflow type [9].…”

“…The two-fluid model is taken to describe the flow of the liquid and gaseous fluids inside the one-dimensional channels. A detailed description of the basic equations and the numerical solution algorithm is given in [9]. In the present case the vapor volume fraction is set to zero and only the equations for the liquid component are solved.…”

Numerical modeling of multiphase flows in microfluidics and micro process engineering: a review of methods and applications

“…However, the porous body approach fully relies on suitable empirical correlations to describe fluid friction and heat transfer. Imke (2004) used conventional pipe flow closure relations and investigated single and two-phase flow (boiling) in cross-flow and counter-flow micro heat exchangers. The predicted outlet temperatures and pressure drops were in rather good agreement with measurements for a wide range of flow rates.…”