The flow field of the proton exchange membrane fuel cell (PEMFC) controls mass and water transfer; it significantly impacts cell's performance. It is critical to innovate design for optimizing This paper proposes a new-designed (NDFF) patterned with built-in blockage trap-shape rib association. novel was analyzed numerically experimentally. A three-dimensional isothermal numerical model first e...

The design flow for primary-shaped microcomponents and microsystems is presented. As a characteristic of microspecific design, the approach is predominantly driven by technology. To integrate the relevant technological demands and restrictions into the design synthesis for a realizable embodiment design in accordance with the specified function, design rules are defined. These represent mandato...

Oscillatory pumping tests-in which flow is varied in a periodic fashion-provide a method for understanding aquifer heterogeneity that is complementary to strategies such as slug testing and constant-rate pumping tests. During oscillatory testing, pressure data collected at non-pumping wells can be processed to extract metrics, such as signal amplitude and phase lag, from a time series. These me...

Proton exchange membrane fuel cells (PEMFCs) have been utilized as a promising power source for new energy vehicles. Their performances are greatly affected by the structural design of flow field in bipolar plate. In this paper, we present novel three-dimensional (3D) bionic cathode field, inspired small intestinal villi. The and working principle 3D units first described. A numerical model is ...

The first lecture in this two-lecture sequence provides background and general concepts. The second lecture provides practical examples. The objective of these two lectures is to provide a modular design optimization tool description that will take into account interaction of the hot gas flow-field, heat transfer in the blade material, internal coolant flow-field, stresses and deformations of t...

The design and preliminary testing of a waveguide electron cyclotron resonance (ECR) heated plasma source is presented in this paper. The design utilizes resonant absorption of traveling microwaves to heat the discharge, avoiding any lifetime constraints on the device due to barium depletion or ion bombardment in more conventional devices. Results from magnetostatic calculations are presented, ...

a newly developed heavy duty diesel engine in dual fuel mode of operation has been studied in detail. the main fuel would be natural gas and diesel oil as pilot injection. the importance and effects of mixture preparation and formation through ports, valves and in cylinder flow field with different swirl ratio and tumble on diesel combustion phenomena is an accepted feature which has been studi...

this paper describes the effects of induced magnetic field and partial slip on the peristaltic flow of a couple stress fluids in an asymmetric channel. the two dimensional equation of couple stress fluid are simplified by making the assumptions of long wave length and low reynolds number. the exact solutions of reduced momentum equation and magnetic force function have been computed in wave fra...

DNA probe arrays have recently emerged as one of the core genomic technologies. Exploiting analogies between manufacturing processes for DNA arrays and for VLSI chips, we demonstrate the potential for transfer of methodologies from the 40-year old field of electronic design automation to the newer DNA array design field. Our main contributions in this paper are the following. (1) We give a new ...