PERFORMANCE IMPROVEMENT OF DOUBLE PIPE HEAT EXCHANGER BY USING TURBULATOR
The various techniques for achieving improved heat transfer are usually referred to as “heat transfer augmentation” or “heat transfer enhancement” and the heat exchanger provided with heat transfer enhancement techniques as “Augmented Heat Exchanger”. The objective is to reduce as many of the factors as possible: Capital Cost, Power Cost, Maintenance Cost, Space and Weight, Consistent with safety and reliability. Present work describes the principal techniques of industrial importance for the augmentation of single phase heat transfer on the inside of tubes namely twisted tapes. So twisted tape should be used in heat exchanger when high heat transfer rate is required and pressure drop is of no significance.
EFFECT OF EXTERNAL THREADED INSIDE TUBE ON HEAT TRANSFER RATE IN A CONCENTRIC TUBE HEAT EXCHANGER: A CRITICAL REVIEW
1 Student, M-Tech, Heat Power Engineering, DBACER, Nagpur, Maharashtra, India. 2 Assistant Professor, Department of Mechanical Engineering, DBACER, Nagpur, Maharashtra, India. ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract Engineers are continually being asked to improve processes and increase efficiency. These requests may arise as a result of the need to increase process throughout, increase profitability, or accommodate capital limitations. The present paper is a review of one of the passive augmentation techniques used in a concentric tube heat exchanger using inner threaded tube. The performance of counter flow heat exchanger will be studied with inner plain tube and inner threaded tube. Then this enhanced performance due to inner threaded tube will be compared with performance of heat exchanger with inner plain tube and percentage of enhancement will be calculated in different hot fluid temperature input and different mass flow rates of hot as well as cold water. Experimentally, Overall heat transfer enhancement will be studied and also, the experimental results will be validated with CFD simulation (FLUENT SOFTWARE).
Automatic classification of TV news articles based on telop character recognition
The purpose of this study is to develop a multimedia database system for TV news video data. TV news video data consist of speech, characters and images. In this study, telop characters are recognized and given to the news articles as indices for classification. At first, telop frames which include telop characters are detected and then the telop characters are extracted and recognized. Through morphological analysis of the recognized telop characters, keywords are extracted which consist of more than two characters. Their keywords are used as indices to classify the TV news articles. We carried out experiments for 30 days of NHK 5 minutes news and obtained 95.4% telop character extraction rate, 81.4% character recognition rate and 83.8% article classification rate. We improved the article classification rate by 43.4% through character recognition improvement from 44.1% to 81.4%.