نتایج جستجو برای: dry cooling
تعداد نتایج: 145451 فیلتر نتایج به سال:
یکی از روشهای متداول برای جلوگیری از تغییر شکل و خواص قطعات در تماس با گازهای داغ، از قبیل پره توربین و دیواره محفظه احتراق، استفاده از تکنیک سرمایش لایه ای (film cooling) می باشد. در روش سرمایش لایه ای شکافی (slot film cooling) سیال خنک کن مانع مانع از انتقال حرارت بین گازهای داغ و سطح فلز می شود. در این حالت می توان تحلیل جریان را به صورت دوبعدی انجام داد. اما در روش سرمایش لایه ای تک سوراخه ...
Due to its excellent strength, plasticity, and fracture toughness, titanium alloy has been widely used in the aerospace field. The specificity of application environment places high demands on surface quality alloy. In this paper, we study effects different lubrication methods microscopic topography, roughness, microhardness TC21 during milling process. include dry, high-pressure air cooling, m...
abstract chickpea is weak in competition of weeds that damages to it at between 40 t0 60 percent. kermanshah province is one of the most important region for chickpea fields in iran. for these reosons, weed management is necessary in this crop. in order to evaluate of herbicides and stubble control on broad leave weeds control in chickpea. experiment was conducted in agricultural research stat...
throughout the present research, squash (cucurbita pepo) slices (0.4 cm thickness and 4 cm diameter) were blanched in a steam chamber for 4 min. following cooling to room temperature, the squash slices were dehydrated by use of a hotair dryer, under air temperature of 60°c up to moisture content of 0.1065 kg h2o per kg d.m. squash slices of specified weights were rehydrated by immersion in dist...
Evaporative cooling by water spray is increasingly used as an efficient and environmentally-friendly approach to enhance thermal comfort in built environments. The complex two-phase flow in a water spray system is influenced by many factors such as continuous phase velocity, temperature and relative humidity patterns, droplet characteristics and continuous phase-droplet and droplet-droplet inte...
Adequate perception of nasal airflow (i.e., nasal patency) is an important consideration for patients with nasal sinus diseases. The perception of a lack of nasal patency becomes the primary symptom that drives these patients to seek medical treatment. However, clinical assessment of nasal patency remains a challenge because we lack objective measurements that correlate well with what patients ...
The cooling system has emerged as an effective way to alleviate the excessive heat generation during dry cutting processes. In this paper, we investigated a novel type of internal cooling system, independent of additional mechanical accessories, as a promising cooling alternative. The proposed system is devised as connected internal fluid channels of a-“V” shape created according to the geometr...
Evaporative cooling is used extensively in low humidity areas of the Southwest United States desert region and throughout other dry climate areas worldwide for residential thermal comfort. A literature review suggested the possibility of evaporative cooling increasing personal exposures to particulate matter along with increased incidences of respiratory illnesses. Indoor and outdoor particulat...
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