Evaluation and Optimization of a Cross-Rib Micro-Channel Heat Sink

This article presents a novel cross-rib micro-channel (MC-CR) heat sink to make fluid self-rotate. For a thermal test chip (TTC) with 100 w/cm2, the cross-ribs micro-channel were compared with the rectangular (MC-R) and horizontal rib micro-channel (MC-HR) heat sinks. The results show that, with the cross-rib micro-channel, the junction temperature of the thermal test chip was 336.49 K, and the pressure drop was 22 kPa. Compared with the rectangular and horizontal ribs heat sink, the cross-rib micro-channel had improvements of 28.6% and 14.3% in cooling capability, but the pressure drop increased by 10.7-fold and 5.5-fold, respectively. Then, the effects of the aspect ratio (λ) of micro-channel in different flow rates were studied. It was found that the aspect ratio and cooling performance were non-linear. To reduce the pressure drop, the inclination (α) and spacing (S) of the cross-ribs were optimized. When α = 30°, S = 0.1 mm, and λ = 4, the pressure drop was reduced from 22 kPa to 4.5 kPa. In addition, the heat dissipation performance of the rectangular, staggered fin (MC-SF), staggered rib (MC-SR) and cross-rib micro-channels were analyzed in the condition of the same pressure drop, MC-CR still has superior heat dissipation performance.

Study on the splitting by hot-air drying of Camellia oleifera fruit

In order to explore the feasibility of hot air splitting of Camellia oleifera fruit, the effect of hot air temperature on peel splitting, the moisture state and moisture migration in peel, the peel microstructure and the seed color were studied. The results showed that higher hot air temperature could accelerate the splitting rate, the optimum temperature for splitting C. oleifera fruit was 90–110 °C considering the seed quality. Page model was the most suitable for describing the drying kinetic characteristics of C. oleifera fruit. Nuclear magnetic resonance (NMR) revealed the changing of the dehydration rate, the migration rate of bound water, immobilized water and free water in peel during hot air drying. The expansion of micro-channels in peel was conducive to moisture migration in the early splitting stage, but microstructure damaged in the late splitting stage accompanied by loose disorder of micro pores, serious shrinkage and deformation of peel.

MANAGEMENT OF SPASTIC QUADRIPLEGIA (SARVANGGHAT) WITH VATKULANTAK RASA & SHASHTIKA SHALI PINDA SWEDA - A CASE STUDY

Background- Spastic Quadriplegia also known as spastic tetraplegia is a subset of Spastic cerebral palsy that af- fects all four limbs (both arms and legs). Spastic quadriplegia usually displays equal involvement of both upper and lower extremities with severe involvement of legs, arms and floppiness of neck. Spastic quadriplegia is gen- erally caused by brain damage either before birth, during or shortly after. In Ayurveda quadriplegia can be corre- lated with Sarvangghat which is a vatavyadhi. It is a nanatmaja vatavyadhi according to charaka. As the disease was caused by vata-kapha dosha. The treatment is mainly aimed at mitigating vata kapha dosha which helps to clear the blocked micro-channels involved in the pathology. Aim and objective- To study the effect of Vatkulan- taka rasa and Shashtika shali pinda sweda in the management of Spastic quadriplegia (Sarvangghat). Material and methods-The present case study is upon 16 years old (male patient) diagnosed case of spastic quadriplegia with complaints of difficulty in walking with stiffness for 6 years at the kayachikitsa IPD of Pt. khushilal Sharma govt. ayurvedic hospital Bhopal. He was treated with shashtika shali pind sweda & Vatkulantaka rasa. The dura- tion of the study is 21 days. The assessment was done on the basis of symptomatic relief after treatment. Observation- The Ayurvedic therapy and oral medication yielded complete symptomatic relief from pain, stiffness and improve quality of life. Conclusion- On the basis of the result obtained, it can be concluded that Shashtika shali pinda sweda and Vatku- lantaka rasa can be used as an effective treatment in the management of Spastic quadriplegia (Sarvangghat). Keywords: Sarvangghat, Spastic quadriplegia, Shashtika shali pinda sweda, Vatkulantaka rasa.

Experimental study of thermal limits with one-side heated smooth channel for plasma facing component safety

In order to stably operate the equipment inside the tokamak, which is loaded with a heat flux of several MW/m2 under the one-side heating condition, it is necessary to thoroughly prepare for various thermal engineering limits that may occur under the high heat flux load condition. In this study, we have experimentally explored critical heat flux (CHF) and onset of flow instability (OFI), which are considered potential threats in a DEMO fusion power plant. Specifically, the effect of system parameters on CHF was investigated. The results indicate that with an increase in subcooling and mass flux, the CHF increased, as it induced a faster bubble condensation near the CHF. As the system pressure increased, the CHF also increased. This is because the bubble size reduction effect was dominant in the pressure range of 1–10 bar. Most of the existing CHF correlations could evaluate the CHF with reasonable accuracy of within 25%; especially, the Boscary CHF correlation yielded the highest accuracy with an average error of 12%. Similar to CHF, OFI, which is a measure of the sudden fluctuations in the system pressure caused by a large amount of vapor generated due to the high heat flux, tended to increase as the subcooling, mass flow rate, and system pressure increased. Most of the existing OFI correlations yielded large error rates (more than 135%) as these correlations were primarily developed for micro-channels. Therefore, in this study, a new OFI correlation was developed using a Python code, in combination with an artificial intelligence (AI) regression method. The developed correlation can be used in the cooling system design of tokamaks, which involve a high-heat load condition on one-side of the reactor.

Design and Fabrication of Multichannel PDMS Microfluidic

Microfluidic delivers miniaturized fluidic networks for processing liquids in the microliter range. In the recent years, lab-on-chip (LOC) is become a main tool for point-of-care (POC) diagnostic especially in the medical field. In this paper, we presented a design and fabrication on multi disease analysis using single chip via delivery of fluid with the multiple transducers is the pathway of multi-channel microfluidic based LOC’s. 3 in 1 nano biosensor kit was attached with the microfluidic to produce nano-biolab-on-chip (NBLOC). The multi channels microfluidic chip was designed including the micro channels, one inlet, three outlet and sensor contact area. The microfluidic chip was designed to include multiplex detection for pathogen that consists of multiple channels of simultaneous results. The LOC system was designed using Design Spark Mechanical software and PDMS was used as a medium of the microfluidic. The microfluidic mold and PDMS microfluidic morphological properties have been characterized by using low power microscope (LPM), high power microscope (HPM) and surface profiler. The LOC system physical was experimental by dropping food coloring through the inlet and collecting at the sensor contact area outlet.