Effects of insertion of coiled wire in juxtaposition with twisted tapes on heat transfer rate and solar radiation without disturbing the flow inside the riser tubes in a solar flat plate collector is experimentally reconnoitered in this present work. The wire coil used as a turbulator is placed inside the riser tube while the twisted tape is inserted into the wire coil to create a continuous sw...

In order to improve thermo-hydraulic performance of laminar flow various techniques has been used among which a plain tube with twisted tape insert is widely used. The main objective numerically study field in enhance heat transfer, through circular pipe built with/without Dimples on strip. Effect and dimple strip thermo hydraulic discussed. analysis results for range 800<Re<2000 obtained...

The present work deals with the results of the experimental investigations carried out on augmentation of turbulent flow heat transfer in a horizontal tube by the means of tube inserts, with air as working fluid. Experiments were carried out initially for the plain tube. Nusselt number and friction factor obtained experimentally were validated against those obtained from theoretical correlation...

A 49-year-old woman had a palpable mass in her occipital region. Plain radiographs and CT examination revealed extensive atlantooccipital pneumatization with findings consistent with the diagnosis of mastoid pneumocele. Decompression was achieved with placement of a myringotomy tube, resulting in prompt symptomatic relief. On a follow-up CT examination, the pneumatized areas had become opacifie...

Typical distribution of exposure parameters in plain radiography is unknown in Portugal. This study aims to identify exposure parameters that are being used in plain radiography in the Lisbon area and to compare the collected data with European references [Commission of European Communities (CEC) guidelines]. The results show that in four examinations (skull, chest, lumbar spine and pelvis), th...

A case of successful endotracheal intubation using an image intensifier in a 9-year-old boy with tracheal stenosis was reported. After the induction of anesthesia, the trachea was observed by use of mobile surgical X-ray apparatus under artificial ventilation using a face mask. Because the tracheal wall of the stenotic part was smooth and seemed soft, we selected a plain 5.5 mm diameter endotra...

1. Mr John Duncan demonstrated?(1.) A method of applying syphon exhaustion to cases of empyema. It consisted essentially of a large flat piece of plain rubber, a long rubber tube, and an airtight pliable bag. The cavity was filled with warm boric lotion. The tube, also filled, was inserted into the cavity through a hole in the plain rubber cut smaller than itself, and an elastic bandage passed ...