In this paper, fluid flow and heat transfer in the laboratory (small size) shell tube heat exchanger are analysed by computational fluid dynamic software. In this type of shell tube heat exchanger baffles with different angles of rotation: 00 (horizontal segmental baffle), 150 (from horizontal), 300, 450, 600, 750, 900 (vertical segmental baffle) is used. Effect of baffle orientation on shell t...

In commercial nuclear power plants, many containments use stainless steel bellows at piping penetrations, in dry well-to-wetwell vent lines, or as a part of the fuel transfer tube. Bellows are an integral part of the primary contain ment pressure boundary in nuclear power plants. These bellows allow for thermal expansion and contraction of the pipe, vent line, or fuel transfer tube, and accommo...

The heterogeneous reaction CO + O + COZ on water ice and various inorganic oxide (Si02, A1203, Fe203, Fe304, CaO, MgO, and Ti02) surfaces has been investigated in order to evaluate the proposition that this heterogeneous reaction may contribute to the COZ stability in the Martian atmosphere. The reaction probabilities were measured at both 196 K and 294 K by using a fast flow-tube reactor coupl...

A heat exchanger network (HEN) for the process of methanol synthesis has been studied by combination of pinch design method and the application of “Twisted Tube” heat exchanger units as a new technology. The HEN is reconstructed based on the full utilization of maximum allowable pressure drops for the process hot and cold streams. An algorithm is developed to generate design procedure for twist...

Introduction The film boiling reactor (FIBOR) is analyzed to show the influence of radiation across the vapor film on product yields. The geometry is that of a horizontal, catalyst-coated, tube suspended in a pool of saturated methanol at atmospheric pressure. The vapor film surrounding the heated tube is the reacting volume and surface reactions are treated with an Arrhenius form of the reacti...

For establishing hydrate-based technologies for natural-gas storage/transport, CO2 capture from industrial flue gases, etc., we need appropriate guidelines for the scale-up of hydrate production/processing equipment from laboratory scales to industrial scales. This paper aims to provide technical remarks on the scale-up of hydrate-forming reactors, the central components of hydrate production/p...

purpose: to evaluate the success rate and complications of single-plate molteno tube implantation in patients with intractable glaucoma. methods: this study was conducted on records of patients who underwent molteno tube implantation from 1995 to 2000 and had at least 18 months of follow-up. results: thirty six eyes of 35 patients including 20 male and 15 female subjects with mean age of 29.7±2...

An investigation into the exhaust emissions of carcinogenic polycyclic aromatic hydrocarbons (PAHs) from a diesel engine was reported. The study is reinforced by experimental results obtained tube reactor aimed at examining PAH formation processes these fuels. paper cantered on 16 priority PAHs suggested United States Environmental Protection Agency (US-EPA). These were produced burning convent...

To improve the growth rate and crystal quality of AlN, the competitive growth mechanisms of AlN under different parameters were studied. The mass transport limited mechanism was competed with the gas-phase parasitic reaction and became dominated at low reactor pressure. The mechanism of strain relaxation at the AlN/Si interface was studied by transmission electron microscopy (TEM). Improved dep...

High quality, micron-sized interpenetrating grains of MgB₂, with high density, are produced at low temperatures (~420 °C < T < ~500 °C) under autogenous pressure by pre-mixing Mg powder and NaBH₄ and heating in an Inconel 601 alloy reactor for 5-15 h. Optimum production of MgB₂, with yields greater than 75%, occurs for autogenous pressure in the range 1.0 MPa to 2.0 MPa, with the reactor at ~50...