Question

5. (Turns 9.17) A temperature sensor is to be placed above a CH4-air jet flame along the extension of the flame's centerline. It is desired to locate the sensor as close as possible to the flame: however, the maximum-temperature operating limit of the sensor is 1200 K. The system operates at 1.0 atm and the air and fuel enter at 300 K. a. Using the simplified state relationships for a diffusion flame, determine the mixture fraction that would correspond to a sensor temperature limit of 1200 K. Assume a constant snecific heat cn of 1087 J/kø-K

Answer 1

Answer:-

• The most generally utilized kind of the considerable number of sensors are those sorts of sensors which recognize Temperature or warmth.
• These sorts of temperature sensor change from straightforward ON/OFF thermostatic gadgets which control a household boiling water warming framework to very touchy semiconductor types that can control complex procedure control heater plants.
• We recall from our school science classes that the development of particles and molecules produces heat (active vitality) and the more noteworthy the development, the more warmth that is created.
• Temperature Sensors measure the measure of warmth vitality or even briskness that is created by an article or framework, enabling us to "sense" or identify any physical change to that temperature delivering either a simple or advanced yield.
• There are a wide range of kinds of Temperature Sensor accessible and all have diverse qualities relying on their real application.
• A temperature sensor comprises of two essential physical sorts:

Contact Temperature Sensor Types – These kinds of temperature sensor are required to be in physical contact with the article being detected and use conduction to screen changes in temperature. They can be utilized to distinguish solids, fluids or gases over a wide scope of temperatures.

Non-contact Temperature Sensor Types – These sorts of temperature sensor use convection and radiation to screen changes in temperature. They can be utilized to distinguish fluids and gases that emanate brilliant vitality as warmth rises and cold settles to the base in convection flows or identify the brilliant vitality being transmitted from an item as infra-red radiation (the sun).

The two essential kinds of contact or even non-contact temperature sensors can likewise be sub-isolated into the accompanying three gatherings of sensors, Electro-mechanical, Resistive and Electronic and every one of the three sorts are talked about beneath.

The Thermostat:-

• The Thermostat is a contact type electro-mechanical temperature sensor or switch, that fundamentally comprises of two unique metals, for example, nickel, copper, tungsten or aluminum and so forth, that are reinforced together to shape a Bi-metallic strip.
• The distinctive straight extension rates of the two disparate metals delivers a mechanical bowing development when the strip is exposed to warm.
• The bi-metallic strip can be utilized itself as an electrical switch or as a mechanical method for working an electrical switch in thermostatic controls and are utilized broadly to control high temp water warming components in boilers, heaters, boiling water stockpiling tanks just as in vehicle radiator cooling frameworks.