Lista de Exercícios Resolvidos - Transferência de Calor e Mecânica dos Fluidos

LISTA DE EXERCÍCIOS 01 Questão 1 O peso de uma placa bem fina e quadrada de 50 cm de lado é equilibrado inicialmente numa balança de braços iguais através de um contrapeso com massa de 30 kg Num outro momento é ligado um ventilador que movimenta o ar para baixo e paralelamente à placa numa velocidade de 10 ms Isto provoca um desequilíbrio da balança como se observa na figura 1 Adotandose as propriedades do ar k 2514x103 WmK1 v 1516x105 m2s1 e Pr 0731 determine a A massa kg que deve ser adicionada na balança para que possa reequilibrar a placa adote g 10 ms2 b O gradiente de temperatura para um fluxo de calor na placa de 03 kW c Se ao contrário da placa utilizase um tubo na horizontal idealize um tubo formado pela própria placa qual seria a velocidade do ar para manter o mesmo fluxo de calor por unidade de temperatura no estado de equilíbrio entre as forças Questão 2 Normalmente em obras de concretagem após nivelamento utilizase água para controlar o processo de cura ou pega da reação química do concreto evitar trincas e outros problemas Numa determinada obra tem se 600 m2 de concreto recém nivelado numa placa de proporções 83 entre comprimento e largura O concreto pode atingir temperaturas superiores a 80ºC e a água utilizada está a 27ºC escoando a 10 ms durante 4 horas Nestas condições e com uma temperatura média de filme de 50ºC determine a As espessuras das camadas hidrodinâmica e térmica à 12 m da borda b O coeficiente convectivo médio c A vazão de água no processo kgs d A potência gerada no processo kW e o custo operacional R 60 por kWh Figura 1 ORIENTAL LILIES August Delivery 10 Blooms Oriental Lilies 10 Blooms Fragrant long lasting Lilies with 56 blooms Gorgeous white with bright orange stamens and green accents Size in a 12 decorative pot preplanted Lilies are a welcome gift for Mothers Day or sympathy flowers Please order them early as quantities are limited Your choice Yellow or White M6005 Medium sized pot Asian Lilies 8 Blooms 8 Blooms Asians Magic Marina Double Oriental Beautiful colorful Asiatic flowers in 10 pots Bright and very fragrant Easy care and hardy in the yard Asiatic varieties are perfect in mixed arrangements Size 10 Pot 68 blooms Groomsman M6011 68 blooms Orange Rocky M6010 68 blooms Pink Sensation M6015 68 blooms Magic Marina M6016 Tiger Lilies Tiger Lilies are the most fragrant of all Lilies blooming 80 days after planting Their exotic drops of bright orange with darker spots are the most recognized floral symbol of the Oriental Lily family You can plant right in to your garden these are perennials Size 8 Pot 68 blooms M6020 Organic Tremont Houseplants Gorgeous Houseplants Growing indoors makes sense in a time of weather uncertainty Their positive energy has a beneficial effect on your mental health and helps relieve stress Botanicals stimulate your creativity and concentration which directly affect your productivity Our plants are carefully cultivated and grown in certified organic soil free from pesticides and other chemicals They come in modern and elegant ceramic pots which will brighten any space Buy organic plant one today and start enjoying it right away We offer a wide variety of houseplants assorted sizes from small to large Please select your preference Medium to large size is available Orchids add beauty to any environment big or small Medium sized orchids in a 6 glass pot are a beautiful addition to your indoor garden White orchid is the most popular easy to grow and keep for years Size 6 glass orchid pot Available colors white pink purple orange yellow M6701 Fresh Flowers Bouquets Choose from our extensive selection of fresh cut flowers variety of colors and types roses tulips daisies billvards gerbers lilies and much more Arranged and creatively tied for gift giving occasion Custom order available on request Seasonal and yearly availability varies Flower bouquet average size 15 height 20 stems Deluxe bouquet M6150 Small bouquet M6151 Call 800 555 1212 2024 Tremont Green Plants Inc All rights reserved Designed and manufactured in the USA 511 Tremont Lane Gardenville CA 94587 wwwtremontgreencom For more info email us at infotremontgreencom Support 8005551212 Plant Care questions 8005551213 Find us on facebook twitter instagram tremontgreenplants Species availability and prices may change without notice For personal use only Not recommended for resale Prices do not include tax and shipping Please call or visit our website for updated or customized items Breeding and images protected under US intellectual property laws Order before July 20 for August delivery We ship nationwide Safely packed with a 14day freshness guarantee or your money back The best in quality and customer service always Key icons for plant care Easy to grow Plant requires medium to low sunlight Requires heavy or moderate watering Requires light watering Best in indoor environments Adds special fragrance Reduces allergies Purifies air Recommended for Fall and Winter Enjoy outdoors after these months Plant care icons key Midwest gardening zone Plant delivers a pleasant scent Morning Sun Partial Shade Shade Watering Heavy Moderate Light Fragrance Allergy Relief Air Purifying Fall Winter Outdoor Use Approved Plant merit