Search Results - "Greif, Ralph"

Investigations of thermal and flow behavior of bifurcations and bends in fractal-like microchannel networks: Secondary flow and recirculation flow by Zhang, Chun-ping, Lian, Yi-fu, Hsu, Cheng-Hsing, Teng, Jyh-tong, Liu, Sheng, Chang, Yaw-Jen, Greif, Ralph

“…In this work, the secondary flow and recirculation flow motions initiated at the bifurcations and bends in symmetric fractal-like microchannel networks with…”
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Numerical and experimental studies on laminar hydrodynamic and thermal characteristics in fractal-like microchannel networks. Part B: Investigations on the performances of pressure drop and heat transfer by Zhang, Chun-ping, Lian, Yi-fu, Yu, Xiang-fei, Liu, Wei, Teng, Jyh-tong, Xu, Ting-ting, Hsu, Cheng-Hsing, Chang, Yaw-Jen, Greif, Ralph

“…In the present paper, the numerical simulations and experiments were carried out to explore the laminar hydrodynamic and thermal characteristics in the…”
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Laser-induced shockwave propagation from ablation in a cavity by Zeng, Xianzhong, Mao, Xianglei, Mao, Samuel S., Wen, Sy-Bor, Greif, Ralph, Russo, Richard E.

“…The propagation of laser-induced shockwaves from ablation inside of cavities was determined from time-resolved shadowgraph images. The temperature and electron…”
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Initiation of an early-stage plasma during picosecond laser ablation of solids by Mao, Samuel S., Mao, Xianglei, Greif, Ralph, Russo, Richard E.

“…Picosecond time-resolved images of plasma initiation were recorded during pulsed-laser ablation of metal targets in an air atmosphere. An early-stage plasma…”
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Comparison of the Organic Flash Cycle (OFC) to other advanced vapor cycles for intermediate and high temperature waste heat reclamation and solar thermal energy by Ho, Tony, Mao, Samuel S., Greif, Ralph

“…The Organic Flash Cycle (OFC) is proposed as a vapor power cycle that could potentially improve the efficiency with which high and intermediate temperature…”
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Increased power production through enhancements to the Organic Flash Cycle (OFC) by Ho, Tony, Mao, Samuel S, Greif, Ralph

“…The previously proposed Organic Flash Cycle (OFC) was shown to potentially improve power generation from finite thermal energy reservoirs. The OFC's primary…”
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Heat Transfer for Water Flow in Triangular Silicon Microchannels by Jiann-Cherng CHU, Jyh-Tong TENG, Ralph GREIF

“…This study investigated the behavior of pressure drops and heat transfer coefficients for four sets of triangular microchannels. Results of this study…”
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Laser-induced plasmas in micromachined fused silica cavities by Zeng, Xianzhong, Mao, Samuel S., Liu, Chunyi, Mao, Xianglei, Greif, Ralph, Russo, Richard E.

“…Cavity formation is a frequent result in many laser ablation applications. Although most theoretical investigations have been devoted to laser ablation on a…”
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A study on five different channel shapes using a novel scheme for meshing and a structure of a multi-nozzle microchannel heat sink by Tran, Ngoctan, Chang, Yaw-Jen, Teng, Jyh-tong, Greif, Ralph

“…•A novel scheme for meshing was proposed.•Five different channel shapes were studied in detail.•A circular channel could dissipate a heat flux up to…”
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A study on fluid flow and heat transfer in rectangular microchannels with various longitudinal vortex generators by Chen, Chen, Teng, Jyh-Tong, Cheng, Ching-Hung, Jin, Shiping, Huang, Suyi, Liu, Chao, Lee, Ming-Tsang, Pan, Hsin-Hung, Greif, Ralph

“…Based on our previous study, experiments were conducted to explore frictional pressure drop and heat transfer performance of de-ionized water flowing through…”
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Enhancement heat transfer rate per unit volume of microchannel heat exchanger by using a novel multi-nozzle structure on cool side by Tran, Ngoctan, Chang, Yaw-Jen, Teng, Jyh-Tong, Greif, Ralph

“…•A novel structure of multi-nozzle microchannel heat exchanger (MN-MCHX) was proposed.•A maximum thermodynamic performance index, ξ, of 9.5W/kPa was…”
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Experimental investigations on liquid flow and heat transfer in rectangular microchannel with longitudinal vortex generators by Liu, Chao, Teng, Jyh-tong, Chu, Jian-Cherng, Chiu, Yi-lang, Huang, Suyi, Jin, Shiping, Dang, Thanhtrung, Greif, Ralph, Pan, Hsin-Hung

“…The behaviors of improved Heat transfer and the associated higher pressure drop for liquid flow in rectangular micochannels with longitudinal vortex generators…”
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Enhancement thermodynamic performance of microchannel heat sink by using a novel multi-nozzle structure by Tran, Ngoctan, Chang, Yaw-Jen, Teng, Jyh-tong, Dang, Thanhtrung, Greif, Ralph

“…•A novel structure of multi-nozzle microchannel heat sink (MN-MCHS) is proposed.•Channel length plays a very important role in controlling the temperature…”
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Experimental and numerical study on the flow characteristics in curved rectangular microchannels by Chu, Jiann-Cherng, Teng, Jyh-Tong, Greif, Ralph

“…In this paper, the flow characteristics in curved rectangular microchannels with different aspect ratios and curvature ratios for Re numbers ranging from 80 to…”
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A study on the hydraulic and thermal characteristics in fractal tree-like microchannels by numerical and experimental methods by Yu, Xiang-fei, Zhang, Chun-ping, Teng, Jyh-tong, Huang, Su-yi, Jin, Shi-ping, Lian, Yi-fu, Cheng, Ching-hung, Xu, Ting-ting, Chu, Jiann-Cherng, Chang, Yaw-Jen, Dang, Thanhtrung, Greif, Ralph

“…This paper focused on the hydraulic and thermal characteristics of fractal tree-like microchannels with different ARs (aspect ratios) for the Reynolds numbers…”
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Transport phenomena in a steam-methanol reforming microreactor with internal heating by Suh, Jeong-Se, Lee, Ming-Tsang, Greif, Ralph, Grigoropoulos, Costas P.

“…An experimental and theoretical study of steam reforming of methanol is carried out in a packed-bed microreactor with internal heating. Experimental results of…”
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A study of the transport phenomena in a wall-coated micro steam-methanol reformer by Lee, Ming-Tsang, Grigoropoulos, Costas P., Greif, Ralph

“…Microreactors have important advantages due to the increased heat and mass transfer resulting from the small dimensions of the system. This results in enhanced…”
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Numerical and experimental studies on laminar hydrodynamic and thermal characteristics in fractal-like microchannel networks. Part A: Comparisons of two numerical analysis methods on friction factor and Nusselt number by Zhang, Chun-ping, Lian, Yi-fu, Yu, Xiang-fei, Liu, Wei, Teng, Jyh-tong, Xu, Ting-ting, Hsu, Cheng-Hsing, Chang, Yaw-Jen, Greif, Ralph

“…In this paper, the conventional equivalent method and the subsectional integral method were used to analyze the friction factor and the Nusselt number in…”
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A study of steam methanol reforming in a microreactor by Suh, Jeong-Se, Lee, Ming-tsang, Greif, Ralph, Grigoropoulos, Costas P.

“…Steam reforming of methanol is investigated numerically considering both heat and mass transfer of the species in a packed bed microreactor. The numerical…”
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Improving efficiency of high-concentrator photovoltaics by cooling with two-phase forced convection by Ho, Tony, Mao, Samuel S., Greif, Ralph

“…The potential of increasing high‐concentrator photovoltaic cell efficiency by cooling with two‐phase flow is analyzed. The governing energy equations were used…”
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