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صوتی
Chapter 14 _ MASS TRANSFER(قسمت سوم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22865#
شرح: The mass-average velocity of a medium at some location is the average velocity of the mass at that location relative to an external reference point. It is the velocity that would be measured by a velocity sensor such as a pitot tube, a turbine device, or a hot wire anemometer inserted into the flow.
Chapter 14 _ MASS TRANSFER(قسمت دوم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22864#
شرح: Steady Mass Diffusion Through a Wall
Chapter 14 _ MASS TRANSFER(قسمت اول)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22863#
شرح: Bulk fluid flow refers to the transportation of a fluid on a macroscopic level from one location to another in a flow section by a mover such as a fan or a pump.
Chapter 13 _ HEAT EXCHANGERS(قسمت چهارم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22862#
شرح: Hot oil is cooled by water in a multi-pass shell-and-tube heat exchanger. The overall heat transfer coefficient based on the inner surface is to be determined.
Chapter 13 _ HEAT EXCHANGERS(قسمت سوم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22861#
شرح: Cold water is heated by hot water in a heat exchanger. The net rate of heat transfer and the heat transfer surface area of the heat exchanger are to be determined.
Chapter 13 _ HEAT EXCHANGERS(قسمت دوم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22860#
شرح: When the heat transfer surface area A of the heat exchanger is known, but the outlet temperatures are not, the effectiveness-NTU method is definitely preferred.
Chapter 13 _ HEAT EXCHANGERS(قسمت اول)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22859#
شرح: Heat exchangers are classified according to the flow type as parallel flow, counter flow, and cross-flow arrangement. In parallel flow, both the hot and cold fluids enter the heat exchanger at the same end and move in the same direction.
Chapter 12 _ RADIATION HEAT TRANSFER(قسمت چهارم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22858#
شرح: The temperature of air in a duct is measured by a thermocouple. The radiation effect on the temperature measurement is to be quantified, and the actual air temperature is to be determined.
Chapter 12 _ RADIATION HEAT TRANSFER(قسمت سوم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22857#
شرح: Yes, roughly one-third of the metabolic heat generated by a person who is resting or doing light work is dissipated to the environment by convection, one-third by evaporation, and the remaining one-third by radiation.
Chapter 12 _ RADIATION HEAT TRANSFER(قسمت دوم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22856#
شرح: A circular grill is considered. The bottom of the grill is covered with hot coal bricks, while the wire mesh on top of the grill is covered with steaks. The initial rate of radiation heat transfer from coal bricks to the steaks is to be determined for two cases.
Chapter 12 _ RADIATION HEAT TRANSFER(قسمت اول)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22855#
شرح: The view factor represents the fraction of the radiation leaving surface i that strikes surface j directly. The view factor from a surface to itself is non-zero for concave surfaces.
Chapter 11 _ FUNDAMENTALS OF THERMAL RADIATION(قسمت دوم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22854#
شرح: The solar constant represents the rate at which solar energy is incident on a surface normal to sun's rays at the outer edge of the atmosphere when the earth is at its mean distance from the sun. It value is . The solar constant is used to estimate the effective surface temperature of the sun from the requirement that
Chapter 11 _ FUNDAMENTALS OF THERMAL RADIATION(قسمت اول)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22853#
شرح: Electromagnetic waves are caused by accelerated charges or changing electric currents giving rise to electric and magnetic fields. Sound waves are caused by disturbances. Electromagnetic waves can travel in vacuum, sound waves cannot.
Chapter 10 _ BOILING AND CONDENSATION(قسمت چهارم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22852#
شرح: Steam at a saturation temperature of Tsat = 40C condenses on the outside of a thin horizontal tube. Heat is transferred to the cooling water that enters the tube at 25C and exits at 35C. The rate of condensation of steam, the average overall heat transfer coefficient, and the tube length are to be determined.
Chapter 10 _ BOILING AND CONDENSATION(قسمت سوم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22851#
شرح: Condensation is a vapor-to-liquid phase change process. It occurs when the temperature of a vapor is reduced below its saturation temperature Tsat. This is usually done by bringing the vapor into contact with a solid surface whose temperature Ts is below the saturation temperature Tsat of the vapor.
Chapter 10 _ BOILING AND CONDENSATION(قسمت دوم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22850#
شرح: Water is boiled at 1 atm pressure and thus at a saturation (or boiling) temperature of Tsat = 100*C by a horizontal nickel plated copper heating element. The maximum (critical) heat flux and the temperature jump of the wire when the operating point jumps from nucleate boiling to film boiling regime are to be determined.
Chapter 10 _ BOILING AND CONDENSATION(قسمت اول)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22849#
شرح: Boiling is the liquid-to-vapor phase change process that occurs at a solid-liquid interface when the surface is heated above the saturation temperature of the liquid.
Chapter 9 _ NATURAL CONVECTION(قسمت پنجم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22848#
شرح: The components of an electronic device located in a horizontal duct of rectangular cross section is cooled by forced air. The heat transfer from the outer surfaces of the duct by natural convection and the average temperature of the duct are to be determined.
Chapter 9 _ NATURAL CONVECTION(قسمت چهارم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22847#
شرح: A small cylindrical resistor mounted on the lower part of a vertical circuit board. The approximate surface temperature of the resistor is to be determined.
Chapter 9 _ NATURAL CONVECTION(قسمت سوم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22846#
شرح: In combined natural and forced convection, the natural convection is negligible when . Otherwise it is not.
Chapter 7_ EXTERNAL FORCED CONVECTION (قسمت پنجم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22845#
شرح: Wind is blowing over the roof of a house. The rate of heat transfer through the roof and the cost of this heat loss for 14-h period are to be determined.
Chapter 4 _TRANSIENT HEAT CONDUCTION (قسمت سوم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22844#
شرح: 4-47 A hot dog is dropped into boiling water, and temperature measurements are taken at certain time intervals. The thermal diffusivity and thermal conductivity of the hot dog and the convection heat transfer coefficient are to be determined.
Chapter 7_ EXTERNAL FORCED CONVECTION (قسمت چهارم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22843#
شرح: Thermal insulation is a material that is used primarily to provide resistance to heat flow. It differs from other kinds of insulators in that the purpose of an electrical insulator is to halt the flow of electric current, and the purpose of a sound insulator is to slow down the propagation of sound waves.
Chapter 7_ EXTERNAL FORCED CONVECTION (قسمت سوم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22842#
شرح: A steam pipe is exposed to a light winds in the atmosphere. The amount of heat loss from the steam during a certain period and the money the facility will save a year as a result of insulating the steam pipe are to be determined.
Chapter 7_ EXTERNAL FORCED CONVECTION (قسمت دوم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22841#
شرح: For the laminar flow, the heat transfer coefficient will be the highest at the stagnation point which corresponds to . In turbulent flow, on the other hand, it will be highest when is between .
Chapter 7_ EXTERNAL FORCED CONVECTION (قسمت اول)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22840#
شرح: The velocity of the fluid relative to the immersed solid body sufficiently far away from a body is called the free-stream velocity, V. The upstream (or approach) velocity V is the velocity of the approaching fluid far ahead of the body.
Chapter 6 _ FUNDAMENTALS OF CONVECTION (قسمت دوم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22839#
شرح: The oil in a journal bearing is considered. The velocity and temperature distributions, the maximum temperature, the rate of heat transfer, and the mechanical power wasted in oil are to be determined. Assumptions 1 Steady operating conditions exist
Chapter 6 _ FUNDAMENTALS OF CONVECTION (قسمت اول)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22838#
شرح: In forced convection, the fluid is forced to flow over a surface or in a tube by external means such as a pump or a fan. In natural convection, any fluid motion is caused by natural means such as the buoyancy effect that manifests itself as the rise of the warmer fluid and the fall of the cooler fluid.
Chapter 5 _ NUMERICAL METHODS IN HEAT CONDUCTION (قسمت ششم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22837#
شرح: The results obtained using a numerical method differ from the exact results obtained analytically because the results obtained by a numerical method are approximate
Chapter 5 _ NUMERICAL METHODS IN HEAT CONDUCTION (قسمت پنجم)
نویسنده: شهر مجازی کتاب
کد کتاب.: 22836#
شرح: A uranium plate initially at a uniform temperature is subjected to insulation on one side and convection on the other. The transient finite difference formulation of this problem is to be obtained, and the nodal temperatures after 5 min and under steady conditions are to be determined.
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