...@cryo.iitkgp.ac.in 17 08 2023 14 12 2023 29 01 2024 axial conduction experimental evidence reciprocating flow microchannels finite-element method heat transfer enhancement Compact microscale heat transfer devices, owing to their high thermal performance and inherently...

...-induced Marangoni hydrodynamics of three-layered, immiscible fluid streams in a microchannel is analytically explored. The system is exposed to periodic and sinusoidal thermal stimuli, and a theoretical framework is presented. The diffusion of the periodic thermal stimuli across and along the fluidic...

... models for prediction of the flow pattern transition, heat transfer and pressure drop characteristics of microchannels. The void fraction can be specified in terms of various geometric definitions: local, chordal, cross-sectional, and volumetric void fraction [ 44 ]. The cross-sectional void fraction...

... by the presence of conjugate effects between fluid and walls in laminar regime (Re < 1000). This paper deals with the analysis of the main features of forced microconvection of liquid and gas flows through microchannels. A critical overview of the main effects that tends to play an important role...

... Pumping ,” IEEE Trans. Dielectr. Electric. Insul. , 16 ( 2 ), pp. 424 – 434 . 10.1109/TDEI.2009.4815174 [8] Singhal , V. , Garimella , S. V. , and Raman , A. , 2004 , “ Microscale Pumping Technologies for Microchannel Cooling Systems ,” Appl. Mech. Rev. , 57 ( 3 ), pp. 191 – 221...

... the walls and fluid regions, which are often of relevance in microchannels flows. The single domain formulation simultaneously models the heat transfer phenomena at both the fluid stream and the channel walls, by making use of coefficients represented as space variable functions, with abrupt transitions...

...T. P. Lagus; F. A. Kulacki Heat transfer coefficients and bubble motion characteristics are reported for two-phase water flow in an array of 13 equally spaced microchannels over an area of 1 cm 2 . Each channel has D h = 451 ± 38 μm, W/H = 0.8, and L/D h = 22.2. Uniform heat flux is applied through...

...Satish G. Kandlikar As the scale of devices becomes small, thermal control and heat dissipation from these devices can be effectively accomplished through the implementation of microchannel passages. The small passages provide a high surface area to volume ratio that enables higher heat transfer...

... are not observed for a 2.3 mm tube. This is clearly an indication that at this tube diameter microscale effects start to exist. They also evaluated flow pattern prediction methods for microchannels and concluded that the method of Ong and Thome [( 16 )] could well predict flow pattern transitions for this tube...

...Ting-Yu Lin; Satish G. Kandlikar A model is developed to analyze the effect of axial conduction on heat transfer during single-phase flow in microchannels. The axial heat conduction in the wall introduces heat flow toward the inlet section resulting in an increase in the local fluid temperature...

... in microchannels. The correlation is based on a data bank covering three diameters of small tubes and two system pressures; R134a was used as a working fluid in all tests. Experimental results of his work and other experimental details can be seen in Owhaib et al. ( 24 ) and Owhaib ( 27 ). The correlation...

... transfer performance of pool boiling systems is not adequate to match the cooling ability provided by enhanced microchannels operating under single-phase conditions. The objective of this work is to evaluate the pool boiling performance of structured surface features etched on a silicon chip...

...Satish G. Kandlikar Accurate prediction of critical heat flux (CHF) in microchannels and minichannels is of great interest in estimating the safe operational limits of cooling systems employing flow boiling. Scale analysis is applied to identify the relevant forces leading to the CHF condition...

...W. Escher; T. Brunschwiler; B. Michel; D. Poulikakos We report an experimental investigation of a novel, high performance ultrathin manifold microchannel heat sink. The heat sink consists of impinging liquid slot-jets on a structured surface fed with liquid coolant by an overlying two-dimensional...

...Akhil Agarwal; Srinivas Garimella Condensation pressure drops and heat transfer coefficients for refrigerant R134a flowing through rectangular microchannels with hydraulic diameters ranging from 100 μ m to 200 μ m are measured in small quality increments. The channels are fabricated on a copper...

...Sarada Kuravi; Krishna M. Kota; Jianhua Du; Louis C. Chow Microchannels are used in applications where large amount of heat is produced. Phase change material (PCM) slurries can be used as a heat transfer fluid in microchannels as they provide increased heat capacity during the melting of phase...

...Ping Cheng; Guodong Wang; Xiaojun Quan Recent work on boiling of water and condensation of steam in single and parallel microchannels is reviewed in this paper. It is found that the amplitude and frequency of fluctuations of temperature and pressure during the unstable flow-boiling mode depend...

..., water is the preferred working fluid for temperatures above 50 ° C . 21 01 2008 15 05 2008 20 10 2008 ammonia capillarity confined flow heat pipes heat transfer microchannel flow organic compounds surface tension viscosity water microheat pipes thermal management...

... significant effects on temperature distribution, heat transfer, and Nusselt number. Couette flow heat transfer microchannel flow pipe flow rotational flow heat transfer microchannels momentum, and energy accommodation coefficients Temperature distribution and heat transfer...

...Dong Liu; Suresh V. Garimella Flow boiling heat transfer to water in microchannels is experimentally investigated. The dimensions of the microchannels considered are 275 × 636 and 406 × 1063 μ m 2 . The experiments are conducted at inlet water temperatures in the range of 67 – 95 ° C and mass...