Hydrogen production by methanol steam reforming in a disc microreactor with tree-shaped flow architectures

Yao, Feng; Chen, Yongping; Peterson, G. P.

doi:10.1016/j.ijheatmasstransfer.2013.04.057

Cited by 51 publications

(17 citation statements)

References 39 publications

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“…Advances are published regularly for heat exchangers [4][5][6][7][8][9][10][11][12][13], fuel cells [14], fluid networks [15][16][17][18][19][20], steam generators [21,22], fluid channels [23][24][25][26][27], energy storage [28], transportation [29][30][31][32], power generation [33][34][35][36][37], and management [38].…”

Section: Technology Evolutionmentioning

confidence: 99%

Entrance-length dendritic plate heat exchangers

Bejan

Alalaimi

Sabau

et al. 2017

International Journal of Heat and Mass Transfer

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a b s t r a c tHere we explore the idea that the highest heat transfer rate between two fluids in a given volume is achieved when plate channel lengths are given by the thermal entrance length, i.e., when the thermal boundary layers meet at the exit of each channel. The overall design can be thought of an elemental construct of a dendritic heat exchanger, which consists of two tree-shaped streams arranged in cross flow. Every channel is as long as the thermal entrance length of the developing flow that resides in that channel. The results indicate that the overall design will change with the total volume and total number of channels. We found that the lengths of the surfaces swept in cross flow would have to decrease sizably as number of channels increases, while exhibiting mild decreases as total volume increases. The aspect ratio of each surface swept by fluid in cross flow should be approximately square, independent of total number of channels and volume. We also found that the minimum pumping power decreases sensibly as the total number of channels and the volume increase. The maximized heat transfer rate per unit volume increases sharply as the total volume decreases, in agreement with the natural evolution toward miniaturization in technology.

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Section: Technology Evolutionmentioning

confidence: 99%

Entrance-length dendritic plate heat exchangers

Bejan

Alalaimi

Sabau

et al. 2017

International Journal of Heat and Mass Transfer

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“…Both of these options would decrease the manufacturing complexity. Wall coating for methanol reformers in micoreactors has been demonstrated with CuZnO catalysts and there are several models of such reactors reported in the literature (42)(43)(44) . Similarly, PdZnO coated porous felts for methanol reforming has also been reported (11,31) .…”

Section: A B C a B Cmentioning

confidence: 99%

3-D model of a radial flow sub-watt methanol fuel processor

Holladay

Wang

2015

Chemical Engineering Science

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A 3-D model is presented for a novel sub-watt packed bed reactor. The reactor uses an annular inlet flow combined with a radial flow packed bed reactor. The baseline reactor is compared to a reactor with multiple outlets and a reactor with 3 internal fins. Increasing the outlets from 1 to 4 may have improved flow distribution, but did not increase the performance. However, inserting fins allowed >99% methanol conversion with approximately 30K decrease in temperature with same inlet flow.

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“…Next challenges are storage and distribution. Biological production of hydrogen technologies provide a wide range of approaches to generate hydrogen, including direct or indirect biophotolysis, photo or dark fermentations (or a process combining both) and hybrid biological hydrogen production by electrochemical processes [1][2][3]. Several microorganisms are able to produce biofuels like hydrogen, but recent studies have targeted cyanobacteria and green microalgae [1,[4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, it is rather difficult to predict which of the various approaches will ultimately succeed in substantial enhancement of hydrogen yields such that the fermentation process of hydrogen generation becomes commercially competitive [3]. Therefore, substantial increases in hydrogen yields can also be achieved through photobioreactor optimal design.…”

Section: Introductionmentioning

confidence: 99%