IJSRET Volume 5 Issue 5, Sep-Oct-2019

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Suitability and Performance of Bubble Deck Slab: A
Review

Authors:- Victor Osaze Francis

Abstract:- Slabs are of extreme importance in any structural construction, as they are primary members. However, about 80% of the concrete in the middle of conventional solid slab are of little structural importance. Bubble deck slab (also known as voided slab) is a phenomenon that removes the structurally-inefficient concrete in the middle of slab by replacing it with high-density spherical plastic balls. This solution will solve the problems of high cost, shorter span, longer construction duration, and environmental pollution associated with the use of traditional slab. This review study investigates how bubble deck slab compares with traditional solid slab in everyday use, under loading condition, and consequently making informed recommendations to minimize the inadequacies of the bubble deck slab system.

A Secure Iot Communication against Reactive Jamming Attack in CRN Subtitle
Authors:- Nitesh Yadav, Dr. Abhishek Bhatt

Abstract:- The number of nodes or IoT devices is sense and control the communication. The primary users are more trustworthy than the secondary users, since these are authorized or licensed users. The purpose of CRN is to intellect the spectrum band and identify the free channels which will be used for un-authorized access user or attacker that flooded the unwanted packets to next node or destination node in network. CRN get better the efficiency of spectrum handling, but it also performance degrades due to new security threats with jamming attacks during the spectrum sensing process, which can corrupt the effectiveness of spectrum sensing. In this research we proposed security scheme against packet flooding Jamming attack. The performance is vitiated in high, medium and low jamming probability and applies the proposed scheme to reduces the flooding. The hop count value based on forward and reverse mechanism of detection and provides secure communication in IoT CRN . The reliability of link is equivalent from the forward and reverse path consistency i.e. more in proposed security scheme as compare to with Batch based SA-MAC scheme. The proper packet forwarding in particular link and the reverse and forward is counted properly but correctly, current node are in suspicious. The record value of hop count is based on the packets receiving but heavy flooding is also disturb it at starting connection establishment procedure.

A Review on Efficient Approach for Scheduling Tasks in Cloud Computing Environments
Authors:- Anjali Kumari, Manoj Lipton

Abstract:- Nowadays, Cloud computing is widely used in companies and enterprises. However, there are some challenges in using Cloud computing. The main challenge is resource management, where Cloud computing provides IT resources (e.g., CPU, Memory, Network, Storage, etc.) Based on virtualization concept and pay-as-you-go principle. The aim of this proposed algorithm is to minimize the completion time and cost of tasks, and maximize resource utilization. The performance of this proposed algorithm has been evaluated using Clouds toolkit. It schedules the entire task within a particular deadline while increasing the system performance. The cloud-sim simulator is used for evaluating the task scheduling like file uploading. In this module we have to initialize the performance of this proposed algorithm has been evaluated using Cloud Sim toolkit. It schedules the entire task within a particular deadline while increasing the system performance. Here we propose a VM Placement aims to distribute the dynamic workload smoothly to all the hosts in the cloud to gain an improvement in both the utilization of Resources and the speed of execution time. It allocates the incoming tasks to all available VMs. In order to achieve balancing and avoid congestion.

A Review on Parametric Study and Optimization of H-Type Finned Tube Heat Exchangers using Taguchi Method
Authors:- M.Tech. Scholar Ankit Raj, Asst. Prof. Brijendra Kumar Yadav

Abstract:- In order to improve the heat exchange efficiency and extend surface heat transfer, H-type finned tubes have been widely used in boilers and waste heat recovery in recent years. H-type finned tubes are derived largely from rectangle finned tubes. Because of their unique groove structure on the fin surface, H-type finned tubes have excellent anti-wear and anti-fouling performance.

Parametric Study and Optimization of H-Type Finned Tube Heat Exchangers using Taguchi Method
Authors:- M.Tech. Scholar Ankit Raj, Asst. Prof. Brijendra Kumar Yadav

Abstract:- Fin and- tube heat exchangers are the typical equipment with extended surface and widely used in many engineering applications, such as air conditioning units, compressor intercoolers, boiler economizers, etc. Heat exchangers are widely used in various industries, such as space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants, petroleum refineries and waste heat recovery process. A heat exchanger is a device used to transfer heat between one or more fluids, which may be separated by a wall to prevent mixing or may be in direct contact. In this study, a parametric study is performed to investigate the effects of geometric parameters on the heat transfer characteristic and the flow friction characteristic of H-type finned tube heat exchangers. The effectiveness of various parameters on the objectives is evaluated and the geometric structure of the H-type finned tube is optimized for the best performance using Taguchi method. The results show that fin height, transversal tube spacing and longitudinal tube spacing is statistically significant to the flow performance characteristics of the H-type finned tube. Hence, these three parameters must be firstly considered and paid more attention during the design and optimization of H-type finned tube heat exchangers. Analysis of variance also further validates that intuitive analysis is correct.

Review Thermal Performance Enhancement of Double Pipe Heat Exchanger With Wavy
Authors:- Research Scholar Kundan Kumar, Asst. Professor Sujeet Kumar Singh

Abstract:- In present study, wavy-tape inserts are introduced to help establish swirl flow inside a straight pipe. Three-dimensional models will be created to simulate the flow and heat transfer characteristics inside the pipe with wavy-tape inserts. CFD simulation will be carried out to investigate the effects of different tape angles on the thermal-hydraulic performance of pipe. The effect of wavy strip tabulators with different angles on the NU, friction factor and thermal performance enhancement factor of double tube heat exchanger was studied.

Thermal Performance Enhancement of Double Pipe Heat Exchanger with Wavy Tape
Authors:- Research Scholar Kundan Kumar, Asst. Professor Sujeet Kumar Singh

Abstract:- CFD simulation will be carried out to investigate the effects of different tape angles on the thermal-hydraulic performance of pipe. The effect of wavy strip tarbulators with different angles on the NU, friction factor and thermal performance enhancement factor of double tube heat exchanger was studied. The configuration, gain in heat transfer augmentation, cost in pressure loss, generated swirl flow character, heat transfer enhancement mechanism, optimal geometric parameters and overall thermal hydraulic performance of wavy-tape are successively expounded in this work. It was seen that the results obtained from the simulation for the plain tube are in a good agreement with those predicted by the standard correlations. It is noted that, in this case the discrepancy between the results is less than 9% for Nusse. lt number and 11% for the friction factor. The wavy-tape induces significant swirl flow inside the pipe. Particularly, pairs of tangential vortices are generated on the flanks of the tape. These vortices break the thermal boundary layer and intensify the fluid advection, which consequently lead to highly localized heat transfer enhancement on the pipe surface.

A Review on Optimization of Heat Transfer in Six-Start Spirally Corrugated Tubes using Taguchi Method
Authors:- M.Tech. Scholar Sanjoo Sahani, Professor Poonam Kumar Agade

Abstract:- Heat transfer devices have been used for conversion and recovery of heat in many industrial and domestic applications. Over five decades, there has been concerted effort to develop design of heat exchanger that can result in reduction in energy requirement as well as material and other cost saving. Heat transfer enhancement techniques generally reduce the thermal resistance either by increasing the effective heat transfer surface area or by generating turbulence. Sometimes these changes are accompanied by an increase in the required pumping power which results in higher cost. The effectiveness of a heat transfer enhancement technique is evaluated by the Thermal Performance Factor which is a ratio of the change in the heat transfer rate to change in friction factor.

Optimization of Heat Transfer in Six-Start Spirally Corrugated Tubes using Taguchi Method
Authors:- M.Tech. Scholar Sanjoo Sahani, Professor Poonam Kumar Agade

Abstract:- In this study, a parametric study is performed to investigate the effects of geometric parameters on the heat transfer characteristic, the flow friction characteristic and overall thermal-hydraulic performance of corrugated tube heat exchangers. The effectiveness of various parameters on the objectives is evaluated and the geometric structure of the corrugated tube is optimized for the best overall thermal-hydraulic performance using Taguchi method. The geometric parameters considered in the model include corrugation height and corrugation pitch. The results show that corrugation height have dominant influence on heat transfer characteristic with contribution ratios of 74.79% respectively while corrugation pitch has minor effects.

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